UITextView自适应高度的解决方案

 1 #import <UIKit/UIKit.h>
 2 
 3 @class VTAutoHeightTextView;
 4 
 5 @protocol VTAutoHeightTextViewDelegate <NSObject>
 6 
 7 @optional
 8 - (void)textView:(VTAutoHeightTextView *)textView heightChanged:(NSInteger)height;
 9 
10 @end
11 
12 @interface VTAutoHeightTextView : UITextView
13 
14 @property (assign, nonatomic) id<UITextViewDelegate, VTAutoHeightTextViewDelegate> delegate;
15 
16 @end
17 　　

 1 #import "VTAutoHeightTextView.h"
 2 
 3 @implementation VTAutoHeightTextView
 4 
 5 - (void)setContentSize:(CGSize)contentSize
 6 {
 7 　　CGSize oriSize = self.contentSize;
 8 　　[super setContentSize:contentSize];
 9 
10 　　if(oriSize.height != self.contentSize.height)
11 　　{
12 　　　　CGRect newFrame = self.frame;
13 　　　　newFrame.size.height = self.contentSize.height;
14 　　　　self.frame = newFrame;
15 　　　　if([self.delegate respondsToSelector:@selector(textView:heightChanged:)])
16 　　　　{
17 　　　　　　[self.delegate textView:self heightChanged:self.contentSize.height - oriSize.height];
18 　　　　}
19 　　}
20 　}
21 
22 @end