1、通过sizeThatFits
// return 'best' size to fit given size. does not actually resize view. Default is return existing view size
- (CGSize)sizeThatFits:(CGSize)size;
（返回“最佳”大小以适合给定大小。实际上不调整视图的大小。默认值是返回现有视图大小）
使用：CGFloat height = 0
height += [self.requestTimeL sizeThatFits:size].height;
2、带段落的换行的文字
-(CGFloat)textHeight:(NSString *)str{
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineBreakMode = NSLineBreakByCharWrapping;
//Attribute传和label设定的一样
NSDictionary * attributes = @{
NSFontAttributeName:[UIFont systemFontOfSize:12.f],
NSParagraphStyleAttributeName: paragraphStyle
};
//这里的size，width传label的宽，高默认都传MAXFLOAT
CGSize textRect = CGSizeMake([UIScreen mainScreen].bounds.size.width - 30, MAXFLOAT);
CGFloat textHeight = [str boundingRectWithSize: textRect
options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading
attributes:attributes
context:nil].size.height;
return textHeight;
}
3、
