给界面上任何控件截图并保存为PNG的方法

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UIView *view = [[[[[UIApplication sharedApplication] windows] objectAtIndex:1] subviews] lastObject]; //获得某个window的某个subView    NSInteger index = 0; //用来给保存的png命名 for (UIView *subView in [view subviews]) { //遍历这个view的subViews      if ([subView isKindOfClass: NSClassFromString (@ "UIImageView" )] || [subView isKindOfClass: NSClassFromString (@ "UIThreePartButton" )]) { //找到自己需要的subView          //支持retina高分的关键          if (UIGraphicsBeginImageContextWithOptions != NULL )          {              UIGraphicsBeginImageContextWithOptions(subView.frame.size, NO , 0.0);          } else {              UIGraphicsBeginImageContext(subView.frame.size);          }                                 //获取图像          [subView.layer renderInContext:UIGraphicsGetCurrentContext()];          UIImage *image = UIGraphicsGetImageFromCurrentImageContext();          UIGraphicsEndImageContext();                     //保存图像          NSString *path = [ NSHomeDirectory () stringByAppendingFormat:@ "/%d.png" ,index];          if ([UIImagePNGRepresentation(image) writeToFile:path atomically: YES ]) {              index += 1;              NSLog (@ "Succeeded!" );          }          else {              NSLog (@ "Failed!" );          }      } } 在真机上可以用以下私有函数截屏，不过苹果会reject用了这个函数的软件。

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CGImageRef UIGetScreenImage();

@interface UIImage (ScreenImage)

+ (UIImage *)imageWithScreenContents;

@end

  

@implementation UIImage (ScreenImage)

+ (UIImage *)imageWithScreenContents

{

    CGImageRef cgScreen = UIGetScreenImage();

    if (cgScreen) {

        UIImage *result = [UIImage imageWithCGImage:cgScreen];

        CGImageRelease(cgScreen);

        return result;

    }

    return nil;

}

@end

转载于:https://www.cnblogs.com/martin1009/archive/2012/02/20/2360303.html