UITextField,UITextView,UILabel 根据内容来计算高度

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在开发的过程中，常常遇到根据内容来决定控件的高度的情况，常见的就是UITextField,UITextView,UILabel这三个控件，下面一UITextView 为例来说明一下：

首先新新建一个textView. 设施text，font

UITextView *textView = [[UITextViewalloc] init];

textView.text =@"2015-01-19 14:07:47.290 MicroPort[3047:103721] -[PPRevealSideViewController gestureRecognizerDidTap:] [Line 1463] Yes, the tap gesture is animated, this is normal, not a bug! Is there anybody here with a non animate interface? :P";

textView.font = [UIFontsystemFontOfSize:14];

float width =200;

float height =[selfheightForString:textView.text fontSize:14 andWidth:width];

textView.frame = CGRectmake(0,0,width,height);

[self.viewaddSubview:textView];

计算textview高度的方法

- (float)heightForString:(NSString*)value fontSize:(float)fontSize andWidth:(float)width//根据字符串的的长度来计算UITextView的高度
{
    float height = [[NSStringstringWithFormat:@"%@\n ",value] boundingRectWithSize:CGSizeMake(width,CGFLOAT_MAX)options:NSStringDrawingUsesLineFragmentOrigin| NSStringDrawingUsesFontLeadingattributes:[NSDictionarydictionaryWithObjectsAndKeys:[UIFontsystemFontOfSize:fontSize],NSFontAttributeName,nil]context:nil].size.height;

    return height;

}

一般情况下常见的需求这个方法都能够满足

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