iOS-文字自适应

Posted on 2015-12-11 19:26 iOS_满聪阅读(714) 评论(0) 编辑收藏举报

1.自动改变Label的宽和高

 1 - (void)createLabel1
 2 {
 3     UILabel * label = [[UILabel alloc] initWithFrame:CGRectZero];
 4     label.backgroundColor = [UIColor redColor];
 5     NSString * str = @"自动改变label的宽和高";
 6     label.text = str;
 7     //这句话一定要放填充字符串的后面
 8     [label sizeToFit];
 9     [self.view addSubview:label];
10 }

2.根据文字信息获取

 1 - (void)createLabel
 2 {
 3     UILabel * label = [[UILabel alloc] initWithFrame:CGRectZero];
 4     label.backgroundColor = [UIColor redColor];
 5     label.font = [UIFont systemFontOfSize:30.0f];
 6     NSString * str = @"计算文本的宽和高";
 7     
 8     NSDictionary * attributes = @{NSFontAttributeName : [UIFont systemFontOfSize:30.0f]};
 9     
10     //计算文本的宽高方式一：
11     CGSize textSize = [str sizeWithAttributes:attributes];
12     
13     //计算文本的宽高方式二：
14     //CGSize textSize = [str boundingRectWithSize:CGSizeMake(MAXFLOAT, MAXFLOAT) options:NSStringDrawingTruncatesLastVisibleLine attributes:attributes context:nil].size;
15     
16     //根据计算的文本宽高重新设置label的frame值
17     [label setFrame:CGRectMake(0, 20, textSize.width, textSize.height)];
18     
19     label.text = str;
20     [label sizeToFit];
21     [self.view addSubview:label];
22 }

3.用Masonry布局自适应

 1 - (void)createLabel2
 2 {
 3     UILabel * label =[UILabel new];
 4     label.backgroundColor = [UIColor orangeColor];
 5     NSString * str = @"用第三方的Masonry布局好简单";
 6     label.textColor = [UIColor grayColor];
 7     label.text = str;
 8     
 9     //甚至这一句都不用写
10     //[label sizeToFit];
11     
12     [self.view addSubview:label];
13     
14     //用Masonry去约束label或者button.不设置label或者button的宽高，它会自己计算的。
15     [label mas_makeConstraints:^(MASConstraintMaker *make) {
16        
17         make.left.equalTo(self.view.mas_left).with.offset(10);
18         make.top.equalTo(self.view.mas_top).with.offset(100);
19     }];
20 }