IOS开发之——图形绘制-仿制UIImageView(7)

发表于 分类于 ， ， 阅读时长 ≈ 1 分钟

一 概述

  • 自定义UIImageView，实现设置图片并显示
  • 点击图片，切换到另一张显示

二 自定义UIImageView，实现设置图片并显示

2.1 一般图片的显示设置

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UIImageView *imgV=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 200, 200)];
imgV.image=[UIImage imageNamed:@"dog"];
[self.view addSubview:imgV];

2.2 自定义UIImageView

MyImageView.h

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@interface MyImageView : UIView
@property (nonatomic,strong) UIImage *image;
@end

MyImageView.m

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#import "MyImageView.h"
@implementation MyImageView
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
    [_image drawInRect:rect];
}
- (void)setImage:(UIImage *)image
{
    _image=image;
    [self setNeedsDisplay];
}
@end

加载图片

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- (void)viewDidLoad {
    [super viewDidLoad]; 
    MyImageView *imgV=[[MyImageView alloc]initWithFrame:CGRectMake(0, 0, 200, 200)];
    imgV.image=[UIImage imageNamed:@"dog"];
    [self.view addSubview:imgV];
    _imgV=imgV;   
}

三 点击图片，切换到另一张显示

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-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    _imgV.image=[UIImage imageNamed:@"dog2"];
}