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 = [[UITextView
alloc] 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 = [UIFont
systemFontOfSize:14];
float width =200;
float height =[self
heightForString:textView.text
fontSize:14 andWidth:width];
textView.frame = CGRectmake(0,0,width,height);
[self.view
addSubview: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