//
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// HMEmoticonTextView.m
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// 表情键盘
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//
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// Created by 刘凡 on 16/3/3.
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// Copyright © 2016年 itcast. All rights reserved.
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//
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#import "HMEmoticonTextView.h"
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#import "HMEmoticonAttachment.h"
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#import "HMEmoticonInputView.h"
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@implementation HMEmoticonTextView {
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UILabel *_placeHolderLabel;
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UILabel *_lengthTipLabel;
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NSMutableArray <NSLayoutConstraint *> *_lengthTipLabelCons;
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/// 表情输入视图
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HMEmoticonInputView *_emoticonInputView;
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}
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#pragma mark - 设置属性
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- (BOOL)isUseEmoticonInputView {
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return self.inputView != nil;
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}
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- (void)setUseEmoticonInputView:(BOOL)useEmoticonInputView {
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if (self.isUseEmoticonInputView == useEmoticonInputView) {
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return;
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}
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self.inputView = (self.inputView == nil) ? _emoticonInputView : nil;
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[self reloadInputViews];
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}
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- (void)setPlaceholder:(NSString *)placeholder {
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_placeholder = placeholder.copy;
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_placeHolderLabel.text = _placeholder;
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}
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- (void)setMaxInputLength:(NSInteger)maxInputLength {
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_maxInputLength = maxInputLength;
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[self textChanged];
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}
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- (void)setFont:(UIFont *)font {
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_placeHolderLabel.font = font;
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[super setFont:font];
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}
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- (void)setText:(NSString *)text {
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[super setText:text];
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[self textChanged];
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}
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- (UIColor *)textColor {
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UIColor *color = [super textColor];
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return (color == nil) ? [UIColor darkGrayColor] : color;
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}
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- (void)setAttributedText:(NSAttributedString *)attributedText {
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[super setAttributedText:attributedText];
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[self textChanged];
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}
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#pragma mark - 构造函数
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- (instancetype)initWithFrame:(CGRect)frame textContainer:(NSTextContainer *)textContainer {
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self = [super initWithFrame:frame textContainer:textContainer];
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if (self) {
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self.textColor = [UIColor darkGrayColor];
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self.font = [UIFont systemFontOfSize:18];
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[self prepareUI];
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}
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return self;
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}
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- (instancetype)initWithCoder:(NSCoder *)coder {
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self = [super initWithCoder:coder];
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if (self) {
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[self prepareUI];
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}
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return self;
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}
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- (void)willMoveToWindow:(UIWindow *)newWindow {
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[super willMoveToWindow:newWindow];
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[self layoutIfNeeded];
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}
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- (void)dealloc {
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[[NSNotificationCenter defaultCenter] removeObserver:self];
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}
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#pragma mark - 公共函数
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- (NSString *)emoticonText {
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NSAttributedString *attributeText = self.attributedText;
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NSMutableString *stringM = [NSMutableString string];
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[attributeText
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enumerateAttributesInRange:
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NSMakeRange(0, attributeText.length)
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options:0
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usingBlock:^(NSDictionary<NSString *,id> * _Nonnull attrs, NSRange range, BOOL * _Nonnull stop) {
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HMEmoticonAttachment *attachment = attrs[@"NSAttachment"];
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if (attachment != nil) {
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[stringM appendString:attachment.text];
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} else {
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[stringM appendString:[attributeText.string substringWithRange:range]];
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}
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}];
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return stringM.copy;
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}
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- (void)insertEmoticon:(HMEmoticon *)emoticon isRemoved:(BOOL)isRemoved {
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if (isRemoved) {
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[self deleteBackward];
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return;
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}
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if (emoticon.isEmoji) {
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[self replaceRange:[self selectedTextRange] withText:emoticon.emoji];
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return;
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}
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NSMutableAttributedString *attributeText = [[NSMutableAttributedString alloc] initWithAttributedString:self.attributedText];
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NSAttributedString *emoticonStr = [HMEmoticonAttachment emoticonStringWithEmoticon:emoticon font:self.font textColor:self.textColor];
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NSRange range = self.selectedRange;
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[attributeText replaceCharactersInRange:range withAttributedString:emoticonStr];
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self.attributedText = attributeText;
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self.selectedRange = NSMakeRange(range.location + 1, 0);
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[self.delegate textViewDidChange:self];
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[[NSNotificationCenter defaultCenter] postNotificationName:UITextViewTextDidChangeNotification object:self];
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}
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- (void)updateTipLabelBottomConstraints:(UIView *)view {
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// 判断 view 是否是当前的子视图
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if (![self.subviews containsObject:view]) {
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NSLog(@"当前仅支持相对 textView 子视图的控件参照");
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return;
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}
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[self removeConstraints:_lengthTipLabelCons];
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[_lengthTipLabelCons removeAllObjects];
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CGFloat margin = 5;
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[_lengthTipLabelCons addObject:[NSLayoutConstraint
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constraintWithItem:_lengthTipLabel
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attribute:NSLayoutAttributeTrailing
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relatedBy:NSLayoutRelationEqual
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toItem:self
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attribute:NSLayoutAttributeTrailing
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multiplier:1.0
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constant:-margin]];
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[_lengthTipLabelCons addObject:[NSLayoutConstraint
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constraintWithItem:_lengthTipLabel
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attribute:NSLayoutAttributeBottom
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relatedBy:NSLayoutRelationEqual
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toItem:view
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attribute:NSLayoutAttributeTop
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multiplier:1.0
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constant:-margin]];
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[self addConstraints:_lengthTipLabelCons];
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}
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#pragma mark - 监听方法
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- (void)textChanged {
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_placeHolderLabel.hidden = self.hasText;
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if (_maxInputLength <= 0) {
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_lengthTipLabel.hidden = YES;
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return;
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}
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_lengthTipLabel.hidden = NO;
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NSInteger len = _maxInputLength - self.emoticonText.length;
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_lengthTipLabel.text = [NSString stringWithFormat:@"%zd", len];
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_lengthTipLabel.textColor = (len >= 0) ? [UIColor lightGrayColor] : [UIColor redColor];
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}
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#pragma mark - 设置界面
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- (void)prepareInputView {
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__weak typeof(self) weakSelf = self;
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_emoticonInputView = [[HMEmoticonInputView alloc] initWithSelectedEmoticon:^(HMEmoticon * _Nullable emoticon, BOOL isRemoved) {
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[weakSelf insertEmoticon:emoticon isRemoved:isRemoved];
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}];
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}
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- (void)prepareUI {
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// 0. 准备输入视图
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[self prepareInputView];
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// 1. 注册文本变化通知
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[[NSNotificationCenter defaultCenter]
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addObserver:self
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selector:@selector(textChanged)
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name:UITextViewTextDidChangeNotification object:nil];
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// 2. 默认属性
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self.alwaysBounceVertical = YES;
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self.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
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// 3. 尺寸视图
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UIView *sizeView = [[UIView alloc] init];
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sizeView.backgroundColor = [UIColor clearColor];
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sizeView.userInteractionEnabled = NO;
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[self insertSubview:sizeView atIndex:0];
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sizeView.translatesAutoresizingMaskIntoConstraints = NO;
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[self addConstraints:[NSLayoutConstraint
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constraintsWithVisualFormat:@"H:|-0-[sizeView]-0-|"
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options:0
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metrics:nil
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views:@{@"sizeView": sizeView}]];
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[self addConstraints:[NSLayoutConstraint
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constraintsWithVisualFormat:@"V:|-0-[sizeView]-0-|"
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options:0
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metrics:nil
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views:@{@"sizeView": sizeView}]];
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[self addConstraint:[NSLayoutConstraint
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constraintWithItem:sizeView
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attribute:NSLayoutAttributeWidth
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relatedBy:NSLayoutRelationEqual
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toItem:self
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attribute:NSLayoutAttributeWidth
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multiplier:1.0
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constant:0]];
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[self addConstraint:[NSLayoutConstraint
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constraintWithItem:sizeView
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attribute:NSLayoutAttributeHeight
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relatedBy:NSLayoutRelationEqual
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toItem:self
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attribute:NSLayoutAttributeHeight
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multiplier:1.0
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constant:0]];
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// 4. 占位标签
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_placeHolderLabel = [[UILabel alloc] init];
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_placeHolderLabel.text = _placeholder;
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_placeHolderLabel.textColor = [UIColor lightGrayColor];
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_placeHolderLabel.font = self.font;
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_placeHolderLabel.numberOfLines = 0;
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[self addSubview:_placeHolderLabel];
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_placeHolderLabel.translatesAutoresizingMaskIntoConstraints = NO;
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CGFloat leftOffset = 5;
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CGFloat topOffset = 8;
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[self addConstraint:[NSLayoutConstraint
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constraintWithItem:_placeHolderLabel
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attribute:NSLayoutAttributeLeading
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relatedBy:NSLayoutRelationEqual
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toItem:self
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attribute:NSLayoutAttributeLeading
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multiplier:1.0
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constant:leftOffset]];
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[self addConstraint:[NSLayoutConstraint
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constraintWithItem:_placeHolderLabel
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attribute:NSLayoutAttributeTop
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relatedBy:NSLayoutRelationEqual
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toItem:self
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attribute:NSLayoutAttributeTop
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multiplier:1.0
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constant:topOffset]];
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[self addConstraint:[NSLayoutConstraint
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constraintWithItem:_placeHolderLabel
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attribute:NSLayoutAttributeWidth
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relatedBy:NSLayoutRelationLessThanOrEqual
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toItem:self
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attribute:NSLayoutAttributeWidth
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multiplier:1.0
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constant:-2 * leftOffset]];
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// 5. 长度提示标签
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_lengthTipLabel = [[UILabel alloc] init];
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_lengthTipLabel.text = [NSString stringWithFormat:@"%zd", _maxInputLength];
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_lengthTipLabel.textColor = [UIColor lightGrayColor];
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_lengthTipLabel.font = [UIFont systemFontOfSize:12];
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[self addSubview:_lengthTipLabel];
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_lengthTipLabel.translatesAutoresizingMaskIntoConstraints = NO;
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_lengthTipLabelCons = [NSMutableArray array];
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[_lengthTipLabelCons addObject:[NSLayoutConstraint
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constraintWithItem:_lengthTipLabel
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attribute:NSLayoutAttributeTrailing
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relatedBy:NSLayoutRelationEqual
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toItem:self
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attribute:NSLayoutAttributeTrailing
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multiplier:1.0
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constant:-leftOffset]];
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[_lengthTipLabelCons addObject:[NSLayoutConstraint
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constraintWithItem:_lengthTipLabel
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attribute:NSLayoutAttributeBottom
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relatedBy:NSLayoutRelationEqual
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toItem:self
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attribute:NSLayoutAttributeBottom
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multiplier:1.0
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constant:-leftOffset]];
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[self addConstraints:_lengthTipLabelCons];
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}
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@end
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