Objective c 比较图像背景

Objective c 比较图像背景,objective-c,xcode,image,compare,Objective C,Xcode,Image,Compare,背景图像已经在Xcode项目中设置好了,但是当点击按钮时它会改变,所以我想检查背景图像80red.png是否与刚才点击的按钮的背景相同 -(IBAction)buttonChange:(id)sender { redImage = [UIImage imageNamed:@"80red.png”]; UIImage *ButtonColour = [sender backgroundImageForState:UIControlStateNormal];

背景图像已经在Xcode项目中设置好了,但是当点击按钮时它会改变,所以我想检查背景图像
80red.png
是否与刚才点击的按钮的背景相同

-(IBAction)buttonChange:(id)sender {

    redImage = [UIImage imageNamed:@"80red.png”];

    UIImage *ButtonColour = [sender backgroundImageForState:UIControlStateNormal];       

    NSData *ButtonColourData = UIImagePNGRepresentation(ButtonColour);
    NSData *redImageData = UIImagePNGRepresentation(redImage);

    if ([ButtonColourData isEqual: redImageData]) {

        // if images are the same
        NSLog(@"Images are the same");    
    }    
}

我不明白为什么我的代码不起作用。

您的代码不起作用,因为您的代码语法有错误

redImage没有链接到对象UIImage类-您必须编写
UIImage*redImage=[UIImage ImageName:@“80red.png]”

下一步:

在比较图像的日期时,可以比较图像的大小,但不同的图像可能大小相同。最好在内容上比较图片

我假装你的处境,这就是我得到的:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.


UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 2, 2)];
[button setBackgroundImage:[UIImage imageNamed:@"80red.png"] forState:UIControlStateNormal];

[self buttonChange:button];

return YES;
}

-(iAction)按钮更改:(id)发件人{

}

我希望我的建议能对你有所帮助


另外,很抱歉我的英语=)

@user2643679如果我的建议对你有帮助,请喜欢它:)
UIImage *redImage = [UIImage imageNamed:@"80red.png"];

UIImage *ButtonColour = [sender backgroundImageForState:UIControlStateNormal];

//NSData *ButtonColourData = UIImagePNGRepresentation(ButtonColour);
//NSData *redImageData = UIImagePNGRepresentation(redImage);

if ([redImage isEqual: ButtonColour]) {

    // if images are the same
    NSLog(@"Images are the same");

}