Uilabel self-sizing in iOS7

Source: Internet
Author: User

UILabel * testlable = [[UILabel alloc]initWithFrame:CGRectMake( 10 , 20 , 200 , 20 )];         NSString * tstring [email protected] "UILabel  ios7 与ios7之前实现自适应撑高的方法,文本的内容长度不一,我们需要根据内容的多少来自动换行处理。在IOS7下要求font,与breakmode与之前设置的完全一致sizeWithFont:font constrainedToSize:size lineBreakMode:NSLineBreakByCharWrapping" ;         testlable.numberOfLines = 2 ;         UIFont * tfont = [UIFont systemFontOfSize: 14 ];         testlable.font = tfont;         testlable.lineBreakMode =NSLineBreakByTruncatingTail ;         testlable.text = tstring ;     [testlable setBackgroundColor:[UIColor redColor]];         [self.view addSubview:testlable];         //高度估计文本大概要显示几行,宽度根据需求自己定义。 MAXFLOAT 可以算出具体要多高         CGSize size =CGSizeMake( 300 , 60 );         // label可设置的最大高度和宽度     //    CGSize size = CGSizeMake(300.f, MAXFLOAT);     //    获取当前文本的属性         NSDictionary * tdic = [NSDictionary dictionaryWithObjectsAndKeys:tfont,NSFontAttributeName,nil];         //ios7方法,获取文本需要的size,限制宽度         CGSize  actualsize =[tstring boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin  attributes:tdic context:nil].size;         // ios7之前使用方法获取文本需要的size,7.0已弃用下面的方法。此方法要求font,与breakmode与之前设置的完全一致     //    CGSize actualsize = [tstring sizeWithFont:font constrainedToSize:size lineBreakMode:NSLineBreakByCharWrapping];     //   更新UILabel的frame             testlable.frame =CGRectMake( 10 , 20 , actualsize.width, actualsize.height);


Uilabel self-sizing in iOS7

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