给界面上任何控件截图并保存为PNG的方法

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