iOS开发中使用Quartz2D绘图及自定义UIImageView控件

    self.yyimageView=yyiv;
    
    //添加一个button按钮，当点击button按钮的时候，切换图片
    UIButton *btn=[[UIButton alloc]initWithFrame:CGRectMake(100, 300, 100, 50)];
    [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [btn setTitle:@"点击切换" forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];

}

-(void)btnClick
{
    NSLog(@"按钮被点击了");
    UIImage *image=[UIImage imageNamed:@"psb.jpeg"];
//    self.imageView.image=image;
    self.yyimageView.image=image;
}
@end

YYimageView.m文件的代码：
复制代码
//
//  YYimageView.m
//  02-自定义UIimageview
//
//  Created by apple on 14-6-22.
//  Copyright (c) 2014年 itcase. All rights reserved.
//

 

#import "YYimageView.h"

@implementation YYimageView

//重写drawRect:方法
- (void)drawRect:(CGRect)rect
{
    [self.image drawInRect:rect];
}

//重写set方法
-(void)setImage:(UIImage *)image
{
    _image=image;
    [self setNeedsDisplay];
}
@end

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