计算UILabel的size

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_label.text = @"自动计算长度";_label.font = [UIFont systemFontOfSize:12.0f];    CGSize size = [self sizeForString:_label.text attribute:@{NSFontAttributeName:_label.font} width:MAXFLOAT];    _label.frame = CGRectMake(0, 0, size.width, size.height);#pragma mark - tool-(CGSize) sizeForString:(NSString*)string attribute:(NSDictionary*) attribute width:(CGFloat)width{    CGRect newFrame = [string boundingRectWithSize:CGSizeMake(width, MAXFLOAT)                                           options:NSStringDrawingUsesLineFragmentOrigin                                        attributes:attribute                                           context:nil];    newFrame.size.height = ceil(newFrame.size.height);    return newFrame.size;}

以上代码就是自动计算UILabel需要的size，通常会限制width，计算至少需要多height.
attribute:这是限定条件，根据实际情况来填写；

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