//
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// UITextView+WZB.m
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// WZBTextView-demo
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//
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// Created by normal on 2016/11/14.
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// Copyright © 2016年 WZB. All rights reserved.
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//
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#import "UITextView+WZB.h"
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#import <objc/runtime.h>
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// 占位文字
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static const void *WZBPlaceholderViewKey = &WZBPlaceholderViewKey;
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// 占位文字颜色
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static const void *WZBPlaceholderColorKey = &WZBPlaceholderColorKey;
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// 最大高度
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static const void *WZBTextViewMaxHeightKey = &WZBTextViewMaxHeightKey;
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// 最小高度
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static const void *WZBTextViewMinHeightKey = &WZBTextViewMinHeightKey;
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// 高度变化的block
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static const void *WZBTextViewHeightDidChangedBlockKey = &WZBTextViewHeightDidChangedBlockKey;
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// 存储添加的图片
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static const void *WZBTextViewImageArrayKey = &WZBTextViewImageArrayKey;
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// 存储最后一次改变高度后的值
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static const void *WZBTextViewLastHeightKey = &WZBTextViewLastHeightKey;
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@interface UITextView ()
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// 存储添加的图片
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@property (nonatomic, strong) NSMutableArray *wzb_imageArray;
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// 存储最后一次改变高度后的值
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@property (nonatomic, assign) CGFloat lastHeight;
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@end
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@implementation UITextView (WZB)
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#pragma mark - Swizzle Dealloc
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+ (void)load {
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// 交换dealoc
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Method dealoc = class_getInstanceMethod(self.class, NSSelectorFromString(@"dealloc"));
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Method myDealloc = class_getInstanceMethod(self.class, @selector(myDealloc));
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method_exchangeImplementations(dealoc, myDealloc);
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}
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- (void)myDealloc {
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// 移除监听
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[[NSNotificationCenter defaultCenter] removeObserver:self];
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UITextView *placeholderView = objc_getAssociatedObject(self, WZBPlaceholderViewKey);
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// 如果有值才去调用，这步很重要
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if (placeholderView) {
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NSArray *propertys = @[@"frame", @"bounds", @"font", @"text", @"textAlignment", @"textContainerInset"];
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for (NSString *property in propertys) {
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@try {
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[self removeObserver:self forKeyPath:property];
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} @catch (NSException *exception) {}
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}
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}
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[self myDealloc];
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}
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#pragma mark - set && get
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- (UITextView *)wzb_placeholderView {
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// 为了让占位文字和textView的实际文字位置能够完全一致，这里用UITextView
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UITextView *placeholderView = objc_getAssociatedObject(self, WZBPlaceholderViewKey);
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if (!placeholderView) {
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// 初始化数组
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self.wzb_imageArray = [NSMutableArray array];
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placeholderView = [[UITextView alloc] init];
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// 动态添加属性的本质是: 让对象的某个属性与值产生关联
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objc_setAssociatedObject(self, WZBPlaceholderViewKey, placeholderView, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
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placeholderView = placeholderView;
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// 设置基本属性
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placeholderView.scrollEnabled = placeholderView.userInteractionEnabled = NO;
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// self.scrollEnabled = placeholderView.scrollEnabled = placeholderView.showsHorizontalScrollIndicator = placeholderView.showsVerticalScrollIndicator = placeholderView.userInteractionEnabled = NO;
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placeholderView.textColor = [UIColor lightGrayColor];
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placeholderView.backgroundColor = [UIColor clearColor];
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[self refreshPlaceholderView];
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[self addSubview:placeholderView];
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// 监听文字改变
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[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textViewTextChange) name:UITextViewTextDidChangeNotification object:self];
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// 这些属性改变时，都要作出一定的改变，尽管已经监听了TextDidChange的通知，也要监听text属性，因为通知监听不到setText：
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NSArray *propertys = @[@"frame", @"bounds", @"font", @"text", @"textAlignment", @"textContainerInset"];
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// 监听属性
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for (NSString *property in propertys) {
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[self addObserver:self forKeyPath:property options:NSKeyValueObservingOptionNew context:nil];
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}
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}
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return placeholderView;
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}
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- (void)setWzb_placeholder:(NSString *)placeholder
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{
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// 为placeholder赋值
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[self wzb_placeholderView].text = placeholder;
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}
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- (NSString *)wzb_placeholder
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{
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// 如果有placeholder值才去调用，这步很重要
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if (self.placeholderExist) {
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return [self wzb_placeholderView].text;
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}
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return nil;
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}
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- (void)setWzb_placeholderColor:(UIColor *)wzb_placeholderColor
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{
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// 如果有placeholder值才去调用，这步很重要
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if (!self.placeholderExist) {
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NSLog(@"请先设置placeholder值！");
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} else {
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self.wzb_placeholderView.textColor = wzb_placeholderColor;
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// 动态添加属性的本质是: 让对象的某个属性与值产生关联
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objc_setAssociatedObject(self, WZBPlaceholderColorKey, wzb_placeholderColor, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
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}
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}
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- (UIColor *)wzb_placeholderColor
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{
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return objc_getAssociatedObject(self, WZBPlaceholderColorKey);
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}
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- (void)setWzb_maxHeight:(CGFloat)wzb_maxHeight
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{
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CGFloat max = wzb_maxHeight;
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// 如果传入的最大高度小于textView本身的高度，则让最大高度等于本身高度
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if (wzb_maxHeight < self.frame.size.height) {
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max = self.frame.size.height;
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}
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objc_setAssociatedObject(self, WZBTextViewMaxHeightKey, [NSString stringWithFormat:@"%lf", max], OBJC_ASSOCIATION_COPY_NONATOMIC);
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}
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- (CGFloat)wzb_maxHeight
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{
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return [objc_getAssociatedObject(self, WZBTextViewMaxHeightKey) doubleValue];
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}
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- (void)setWzb_minHeight:(CGFloat)wzb_minHeight
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{
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objc_setAssociatedObject(self, WZBTextViewMinHeightKey, [NSString stringWithFormat:@"%lf", wzb_minHeight], OBJC_ASSOCIATION_COPY_NONATOMIC);
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}
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- (CGFloat)wzb_minHeight
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{
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return [objc_getAssociatedObject(self, WZBTextViewMinHeightKey) doubleValue];
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}
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- (void)setWzb_textViewHeightDidChanged:(textViewHeightDidChangedBlock)wzb_textViewHeightDidChanged
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{
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objc_setAssociatedObject(self, WZBTextViewHeightDidChangedBlockKey, wzb_textViewHeightDidChanged, OBJC_ASSOCIATION_COPY_NONATOMIC);
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}
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- (textViewHeightDidChangedBlock)wzb_textViewHeightDidChanged
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{
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void(^textViewHeightDidChanged)(CGFloat currentHeight) = objc_getAssociatedObject(self, WZBTextViewHeightDidChangedBlockKey);
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return textViewHeightDidChanged;
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}
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- (NSArray *)wzb_getImages
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{
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return self.wzb_imageArray;
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}
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- (void)setLastHeight:(CGFloat)lastHeight {
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objc_setAssociatedObject(self, WZBTextViewLastHeightKey, [NSString stringWithFormat:@"%lf", lastHeight], OBJC_ASSOCIATION_COPY_NONATOMIC);
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}
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- (CGFloat)lastHeight {
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return [objc_getAssociatedObject(self, WZBTextViewLastHeightKey) doubleValue];
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}
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- (void)setWzb_imageArray:(NSMutableArray *)wzb_imageArray {
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objc_setAssociatedObject(self, WZBTextViewImageArrayKey, wzb_imageArray, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
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}
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- (NSMutableArray *)wzb_imageArray {
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return objc_getAssociatedObject(self, WZBTextViewImageArrayKey);
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}
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- (void)wzb_autoHeightWithMaxHeight:(CGFloat)maxHeight
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{
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[self wzb_autoHeightWithMaxHeight:maxHeight textViewHeightDidChanged:nil];
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}
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// 是否启用自动高度，默认为NO
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static bool autoHeight = NO;
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- (void)wzb_autoHeightWithMaxHeight:(CGFloat)maxHeight textViewHeightDidChanged:(textViewHeightDidChangedBlock)textViewHeightDidChanged
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{
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autoHeight = YES;
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[self wzb_placeholderView];
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self.wzb_maxHeight = maxHeight;
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if (textViewHeightDidChanged) self.wzb_textViewHeightDidChanged = textViewHeightDidChanged;
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}
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#pragma mark - addImage
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/* 添加一张图片 */
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- (void)wzb_addImage:(UIImage *)image
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{
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[self wzb_addImage:image size:CGSizeZero];
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}
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/* 添加一张图片 image:要添加的图片 size:图片大小 */
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- (void)wzb_addImage:(UIImage *)image size:(CGSize)size
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{
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[self wzb_insertImage:image size:size index:self.attributedText.length > 0 ? self.attributedText.length : 0];
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}
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/* 插入一张图片 image:要添加的图片 size:图片大小 index:插入的位置 */
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- (void)wzb_insertImage:(UIImage *)image size:(CGSize)size index:(NSInteger)index
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{
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[self wzb_addImage:image size:size index:index multiple:-1];
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}
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/* 添加一张图片 image:要添加的图片 multiple:放大／缩小的倍数 */
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- (void)wzb_addImage:(UIImage *)image multiple:(CGFloat)multiple
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{
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[self wzb_addImage:image size:CGSizeZero index:self.attributedText.length > 0 ? self.attributedText.length : 0 multiple:multiple];
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}
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/* 插入一张图片 image:要添加的图片 multiple:放大／缩小的倍数 index:插入的位置 */
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- (void)wzb_insertImage:(UIImage *)image multiple:(CGFloat)multiple index:(NSInteger)index
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{
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[self wzb_addImage:image size:CGSizeZero index:index multiple:multiple];
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}
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/* 插入一张图片 image:要添加的图片 size:图片大小 index:插入的位置 multiple:放大／缩小的倍数 */
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- (void)wzb_addImage:(UIImage *)image size:(CGSize)size index:(NSInteger)index multiple:(CGFloat)multiple {
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if (image) [self.wzb_imageArray addObject:image];
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NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithAttributedString:self.attributedText];
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NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init];
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textAttachment.image = image;
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CGRect bounds = textAttachment.bounds;
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if (!CGSizeEqualToSize(size, CGSizeZero)) {
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bounds.size = size;
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textAttachment.bounds = bounds;
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} else if (multiple <= 0) {
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CGFloat oldWidth = textAttachment.image.size.width;
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CGFloat scaleFactor = oldWidth / (self.frame.size.width - 10);
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textAttachment.image = [UIImage imageWithCGImage:textAttachment.image.CGImage scale:scaleFactor orientation:UIImageOrientationUp];
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} else {
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bounds.size = image.size;
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textAttachment.bounds = bounds;
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}
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NSAttributedString *attrStringWithImage = [NSAttributedString attributedStringWithAttachment:textAttachment];
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[attributedString replaceCharactersInRange:NSMakeRange(index, 0) withAttributedString:attrStringWithImage];
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self.attributedText = attributedString;
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[self textViewTextChange];
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[self refreshPlaceholderView];
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}
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#pragma mark - KVO监听属性改变
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- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
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[self refreshPlaceholderView];
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if ([keyPath isEqualToString:@"text"]) [self textViewTextChange];
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}
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// 刷新PlaceholderView
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- (void)refreshPlaceholderView {
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UITextView *placeholderView = objc_getAssociatedObject(self, WZBPlaceholderViewKey);
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// 如果有值才去调用，这步很重要
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if (placeholderView) {
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self.wzb_placeholderView.frame = self.bounds;
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if (self.wzb_maxHeight < self.bounds.size.height) self.wzb_maxHeight = self.bounds.size.height;
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self.wzb_placeholderView.font = self.font;
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self.wzb_placeholderView.textAlignment = self.textAlignment;
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self.wzb_placeholderView.textContainerInset = self.textContainerInset;
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self.wzb_placeholderView.hidden = (self.text.length > 0 && self.text);
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}
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}
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// 处理文字改变
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- (void)textViewTextChange {
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UITextView *placeholderView = objc_getAssociatedObject(self, WZBPlaceholderViewKey);
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// 如果有值才去调用，这步很重要
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if (placeholderView) {
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self.wzb_placeholderView.hidden = (self.text.length > 0 && self.text);
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}
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// 如果没有启用自动高度，不执行以下方法
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if (!autoHeight) return;
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if (self.wzb_maxHeight >= self.bounds.size.height) {
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// 计算高度
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NSInteger currentHeight = ceil([self sizeThatFits:CGSizeMake(self.bounds.size.width, MAXFLOAT)].height);
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// 如果高度有变化，调用block
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if (currentHeight != self.lastHeight) {
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// 是否可以滚动
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self.scrollEnabled = currentHeight >= self.wzb_maxHeight;
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CGFloat currentTextViewHeight = currentHeight >= self.wzb_maxHeight ? self.wzb_maxHeight : currentHeight;
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// 改变textView的高度
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if (currentTextViewHeight >= self.wzb_minHeight) {
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CGRect frame = self.frame;
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frame.size.height = currentTextViewHeight;
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self.frame = frame;
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// 调用block
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if (self.wzb_textViewHeightDidChanged) self.wzb_textViewHeightDidChanged(currentTextViewHeight);
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// 记录当前高度
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self.lastHeight = currentTextViewHeight;
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}
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}
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}
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if (!self.isFirstResponder) [self becomeFirstResponder];
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}
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// 判断是否有placeholder值，这步很重要
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- (BOOL)placeholderExist {
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// 获取对应属性的值
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UITextView *placeholderView = objc_getAssociatedObject(self, WZBPlaceholderViewKey);
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// 如果有placeholder值
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if (placeholderView) return YES;
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return NO;
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}
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@end
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