UITextView自适应高度

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之前textView算文字高度总是拿不到合适的高度。在Stack Overflow 找到了解决方法备注在此。

代码如下：

 UITextView * textView=[[UITextView alloc] initWithFrame:CGRectMake(20, 40, self.view.frame.size.width-40, 20)];    textView.text=@"   I'm porting one of apps from iOS 6.1 to iOS 7. I'm using a layout where there's a UITextView that has a fix width, but it's height is based on its contentsize. For iOS 6.1 checking the contentsize.height and setting it as the textview's frame height was enough, but it doesn't work on iOS 7.\n  How can i then create a UITextView with a fixed width, but dynamic height based on the text it's showing? \n";    textView.textColor=[UIColor brownColor];    textView.font=[UIFont systemFontOfSize:14.0];    textView.layer.borderColor=[[UIColor lightGrayColor] CGColor];    textView.layer.borderWidth=1.0f;    [self.view addSubview:textView];            CGFloat fixedWidth = textView.frame.size.width;    CGSize newSize = [textView sizeThatFits:CGSizeMake(fixedWidth, MAXFLOAT)];    CGRect newFrame = textView.frame;    newFrame.size = CGSizeMake(fmaxf(newSize.width, fixedWidth), newSize.height);    textView.frame = newFrame;

下面是这个demo：

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