根据Text动态获取UILabel的高度，为iOS 7.0和iOS 6.1返回不同的值 [英] Dynamically getting height of UILabel according to Text return different Value for iOS 7.0 and iOS 6.1

问题描述

我正在使用此方法动态获取UILabel的高度：

I am using the this method for getting the height of the UILabel Dynamically:

+(CGSize) GetSizeOfLabelForGivenText:(UILabel*)label Font:(UIFont*)fontForLabel Size:  (CGSize)LabelSize{
    label.numberOfLines = 0;
    CGSize labelSize = [label.text sizeWithFont:fontForLabel constrainedToSize:LabelSize lineBreakMode:NSLineBreakByCharWrapping];
    return (labelSize);
}

使用此解决方案，如果我的代码正在运行，我将获得UILabel的确切大小在iOS 8以下
但是如果我在iOS7上运行我的应用程序，那么它将返回一个不同的值。

With this solution I am getting the exact size of UILabel if my code is running on below iOS 8 but if I run my application on iOS7 then it is returns a different value.

推荐答案

你必须动态设置框架，如下所示：

You have to dynamically set the frame, like below:

//Compatible for both ios6 and ios7.  

CGSize constrainedSize = CGSizeMake(self.resizableLable.frame.size.width  , 9999);

NSDictionary *attributesDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
                                      [UIFont fontWithName:@"HelveticaNeue" size:11.0], NSFontAttributeName,
                                      nil];

NSMutableAttributedString *string = [[NSMutableAttributedString alloc] initWithString:@"textToShow" attributes:attributesDictionary];

CGRect requiredHeight = [string boundingRectWithSize:constrainedSize options:NSStringDrawingUsesLineFragmentOrigin context:nil];

if (requiredHeight.size.width > self.resizableLable.frame.size.width) {
    requiredHeight = CGRectMake(0,0, self.resizableLable.frame.size.width, requiredHeight.size.height);
}
CGRect newFrame = self.resizableLable.frame;
newFrame.size.height = requiredHeight.size.height;
self.resizableLable.frame = newFrame;

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