iOS常用技术-气泡文本自适应
1 // 2 // ChatBubble.h 3 // ChatBubble 4 // 5 // Created by 大欢 on 16/1/21. 6 // Copyright © 2016年 bjsxt. All rights reserved. 7 // 8 9 #import <UIKit/UIKit.h> 10 11 @interface ChatBubble : UIImageView 12 13 //显示的文字 14 @property (nonatomic, copy) NSString * text; 15 16 @end
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1 // 2 // ChatBubble.m 3 // ChatBubble 4 // 5 // Created by 大欢 on 16/1/21. 6 // Copyright © 2016年 bjsxt. All rights reserved. 7 // 8 9 #import "ChatBubble.h" 10 11 //文字距图片左边距 12 static const CGFloat kLeftMargin = 20; 13 14 //文字距图片上，下，右边距 15 static const CGFloat kOtherMargin = 10; 16 17 @interface ChatBubble () 18 19 @property (nonatomic, strong) UILabel * textLabel; 20 21 @end 22 23 @implementation ChatBubble 24 25 - (UILabel *)textLabel { 26 27 if (!_textLabel) { 28 _textLabel = [[UILabel alloc] init]; 29 _textLabel.font = [UIFont systemFontOfSize:17]; 30 _textLabel.textColor = [UIColor blackColor]; 31 _textLabel.numberOfLines = 0; 32 } 33 return _textLabel; 34 } 35 36 - (instancetype)initWithFrame:(CGRect)frame { 37 38 if (self = [super initWithFrame:frame]) { 39 40 //拉伸图片 41 self.image = [UIImage imageNamed:@"qipao"]; 42 self.image = [self.image resizableImageWithCapInsets:UIEdgeInsetsMake(25, 15, 5, 5) resizingMode:UIImageResizingModeStretch]; 43 //加载label 44 [self addSubview:self.textLabel]; 45 } 46 return self; 47 } 48 49 - (void)setText:(NSString *)text { 50 51 _text = text; 52 _textLabel.text = text; 53 } 54 55 - (CGSize)sizeThatFits:(CGSize)size { 56 57 //计算Label的宽度 58 CGFloat width = size.width - kLeftMargin - kOtherMargin; 59 //根据Label的宽度计算出Label的高度 60 CGSize sizeLabel = [_textLabel sizeThatFits:CGSizeMake(width, MAXFLOAT)]; 61 //设置Label的frame 62 _textLabel.frame = CGRectMake(kLeftMargin, kOtherMargin, sizeLabel.width, sizeLabel.height); 63 64 CGFloat imageWidth = size.width; 65 //计算imageview的高度 66 CGFloat imageHeight = kOtherMargin * 2 + _textLabel.frame.size.height; 67 68 return CGSizeMake(imageWidth, imageHeight); 69 } 70 71 @end
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1 // 2 // ViewController.m 3 // ChatBubble 4 // 5 // Created by 大欢 on 16/1/21. 6 // Copyright © 2016年 bjsxt. All rights reserved. 7 // 8 9 #import "ViewController.h" 10 #import "ChatBubble.h" 11 12 @interface ViewController () 13 14 @end 15 16 @implementation ViewController 17 18 - (void)viewDidLoad { 19 [super viewDidLoad]; 20 21 CGFloat width = self.view.frame.size.width - 60; 22 23 ChatBubble * bubble = [[ChatBubble alloc] init]; 24 bubble.text = @"初期投资66亿美元，最终长度为400英里，总投资330亿美元，折合每英里8250万美元。而超级高铁项目建设成本约为每英里2000万美元,😊"; 25 CGSize size = [bubble sizeThatFits:CGSizeMake(width, MAXFLOAT)]; 26 bubble.frame = CGRectMake(20, 30, size.width, size.height); 27 [self.view addSubview:bubble]; 28 29 } 30 31 @end
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