如何以编程方式截取屏幕截图 [英] How to take a screenshot programmatically

问题描述

我想在屏幕上保存到保存的照片库中的图像截图

I want a screenshot of the image on the screen saved into the saved photo library

推荐答案

考虑检查视网膜显示器使用以下代码片段：

Considering a check for retina display use the following code snippet:

#import <QuartzCore/QuartzCore.h> 

if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
    UIGraphicsBeginImageContextWithOptions(self.window.bounds.size, NO, [UIScreen mainScreen].scale);
} else {
    UIGraphicsBeginImageContext(self.window.bounds.size);
}

[self.window.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *imageData = UIImagePNGRepresentation(image);
if (imageData) {
    [imageData writeToFile:@"screenshot.png" atomically:YES];
} else {
    NSLog(@"error while taking screenshot");
}

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