//
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// UITextView+Expand.m
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// airtree
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//
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// Created by WindShan on 2016/11/18.
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// Copyright © 2016年 Gloria. All rights reserved.
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//
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#import "UITextView+Expand.h"
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#import <objc/runtime.h>
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@interface UITextView ()<UITextViewDelegate>
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@property (nonatomic,strong) UILabel *wordCountLabel;//计算字数
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@end
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@implementation UITextView (Expand)
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static NSString *PLACEHOLDLABEL = @"placelabel";
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static NSString *PLACEHOLD = @"placehold";
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static NSString *WORDCOUNTLABEL = @"wordcount";
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static const void *limitLengthKey = &limitLengthKey;
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#pragma mark -- set/get...
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-(void)setPlaceholderLabel:(UILabel *)placeholderLabel {
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objc_setAssociatedObject(self, &PLACEHOLDLABEL, placeholderLabel, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
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}
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- (UILabel *)placeholderLabel {
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return objc_getAssociatedObject(self, &PLACEHOLDLABEL);
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}
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- (void)setPlaceholder:(NSString *)placeholder {
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objc_setAssociatedObject(self, &PLACEHOLD, placeholder, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
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[self setPlaceHolderLabel:placeholder];
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}
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- (NSString *)placeholder {
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return objc_getAssociatedObject(self, &PLACEHOLD);
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}
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- (UILabel *)wordCountLabel {
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return objc_getAssociatedObject(self, &WORDCOUNTLABEL);
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}
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- (void)setWordCountLabel:(UILabel *)wordCountLabel {
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objc_setAssociatedObject(self, &WORDCOUNTLABEL, wordCountLabel, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
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}
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- (NSNumber *)limitLength {
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return objc_getAssociatedObject(self, limitLengthKey);
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}
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- (void)setLimitLength:(NSNumber *)limitLength {
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objc_setAssociatedObject(self, limitLengthKey, limitLength, OBJC_ASSOCIATION_COPY_NONATOMIC);
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[self addLimitLengthObserver:[limitLength intValue]];
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[self setWordcountLable:limitLength];
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}
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#pragma mark -- 配置占位符标签
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- (void)setPlaceHolderLabel:(NSString *)placeholder {
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/*
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* 占位字符
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*/
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self.placeholderLabel = [[UILabel alloc] init];
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self.placeholderLabel.font = [UIFont systemFontOfSize:13.];
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self.placeholderLabel.text = placeholder;
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self.placeholderLabel.numberOfLines = 0;
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self.placeholderLabel.lineBreakMode = NSLineBreakByWordWrapping;
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self.placeholderLabel.textColor = [UIColor lightGrayColor];
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CGRect rect = [placeholder boundingRectWithSize:CGSizeMake(CGRectGetWidth(self.frame)-7, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:13.]} context:nil];
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self.placeholderLabel.frame = CGRectMake(7, 7, rect.size.width, rect.size.height);
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self.delegate = self;
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[self addSubview:self.placeholderLabel];
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}
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#pragma mark -- 配置字数限制标签
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- (void)setWordcountLable:(NSNumber *)limitLength {
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/*
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* 字数限制 "0/120"格式
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*/
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self.wordCountLabel = [[UILabel alloc] initWithFrame:CGRectMake(CGRectGetWidth(self.frame) - 65, CGRectGetHeight(self.frame) - 20, 60, 20)];
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self.wordCountLabel.textAlignment = NSTextAlignmentRight;
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self.wordCountLabel.textColor = [UIColor lightGrayColor];
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self.wordCountLabel.font = [UIFont systemFontOfSize:13.];
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//"xxx/xxx"格式
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//self.wordCountLabel.text = [NSString stringWithFormat:@"0/%@",limitLength];
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//"xxx"格式
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self.wordCountLabel.text = [NSString stringWithFormat:@"%@",limitLength];
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self.delegate = self;
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[self addSubview:self.wordCountLabel];
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}
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#pragma mark -- 增加限制位数的通知
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- (void)addLimitLengthObserver:(int)length {
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[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(limitLengthEvent) name:UITextViewTextDidChangeNotification object:self];
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}
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#pragma mark -- 限制输入的位数
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- (void)limitLengthEvent {
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if ([self.text length] > [self.limitLength intValue]) {
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self.text = [self.text substringToIndex:[self.limitLength intValue]];
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}
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}
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#pragma mark -- TextViewDelegate
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- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
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if (self.placeholder)
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{
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self.placeholderLabel.hidden = YES;
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if (textView.text.length == 1 && text.length == 0) {
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self.placeholderLabel.hidden = NO;
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}
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}
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return YES;
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}
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- (void)textViewDidChange:(UITextView *)textView {
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if (self.limitLength) {
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NSInteger wordCount = textView.text.length;
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if (wordCount > [self.limitLength integerValue]) {
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wordCount = [self.limitLength integerValue];
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}
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//"xxx/xxx"格式
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//self.wordCountLabel.text = [NSString stringWithFormat:@"%ld/%@",wordCount,self.limitLength];
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//"xxx"格式
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self.wordCountLabel.text = [NSString stringWithFormat:@"%ld", [self.limitLength integerValue]-wordCount];
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}
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}
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@end
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