iOS UILabel自适应

根据文字 字数动态确定Label宽高

//设置Label的字体 HelveticaNeue  Courier
UIFont *fnt = [UIFont fontWithName:@"HelveticaNeue" size:24.0f];
_nameLabel.font = fnt;
//根据字体得到NSString的尺寸
CGSize size = [_nameLabel.text sizeWithAttributes:[NSDictionary dictionaryWithObjectsAndKeys:fnt,NSFontAttributeName, nil]];
//名字的高度
CGFloat nameH = size.height;
//名字的宽度
CGFloat nameW = size.width;
//重新给Label的frame赋值
_nameLabel.frame = CGRectMake(0, 0, nameW,nameH);

根据正文内容多少,动态确定正文content的frame

 // 宽度W
CGFloat contentW = self.bounds.size.width - _content.frame.origin.x - kMargin;
// label的字体 HelveticaNeue  Courier
UIFont *fnt = [UIFont fontWithName:@"HelveticaNeue" size:18.0f];
_content.font = fnt;
_content.numberOfLines = 0;
_content.lineBreakMode = NSLineBreakByWordWrapping;
// iOS7中用以下方法替代过时的iOS6中的sizeWithFont:constrainedToSize:lineBreakMode:方法
CGRect tmpRect = [_content.text boundingRectWithSize:CGSizeMake(contentW, 1000) options:NSStringDrawingUsesLineFragmentOrigin attributes:[NSDictionary dictionaryWithObjectsAndKeys:fnt,NSFontAttributeName, nil] context:nil];
// 高度H
CGFloat contentH = tmpRect.size.height;
NSLog(@"调整后的显示宽度:%f,显示高度:%f"contentW,contentH);
_content.frame = CGRectMake(0, 0, contentW,contentH);