UIImage 等于 [英] UIImage is equal to

问题描述

我需要检查加载到 UIImage 对象文件中的文件是否等于另一个图像，如果是，则执行一些操作.不幸的是，它不起作用.

I need to check if a file loaded into an UIImage object file is equal to another image and execute some actions if so. Unfortunately, it's not working.

emptyImage = UIImage(named: imageName)

if(image1.image != emptyImage) {
    // do something
} else {
    // do something
}

上面的代码总是进入if分支.

The above code always enters the if branch.

推荐答案

您可以将 UIImage 实例转换为 NSData 实例并进行比较.

You can convert your UIImage instances to NSData instances and compare them.

if let emptyImage = UIImage(named: "empty") {
    let emptyData = UIImagePNGRepresentation(emptyImage)
    let compareImageData = UIImagePNGRepresentation(image1.image)

    if let empty = emptyData, compareTo = compareImageData {
        if empty.isEqualToData(compareTo) {
            // Empty image is the same as image1.image
        } else {
            // Empty image is not equal to image1.image
        }
    } else {
        // Creating NSData from Images failed
    }
}

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