IOS給任意UIView截屏

[cpp] //獲得某個window的某個subView  UIView *view = [[[[[UIApplication sharedApplication] windows] objectAtIndex:0] subviews] lastObject];    NSInteger index = 0;//用來給儲存的png命名  for (UIView *subView in [view subviews]) {//遍曆這個view的subViews  if ([subView isKindOfClass:NSClassFromString(@"MKMapView")]) {//找到自己需要的subView  NSLog(@"fund");  //支援retina高分的關鍵  if(UIGraphicsBeginImageContextWithOptions != NULL)  {  UIGraphicsBeginImageContextWithOptions(subView.frame.size, NO, 0.0);  } else {  UIGraphicsBeginImageContext(subView.frame.size);  }    //擷取映像  [subView.layer renderInContext:UIGraphicsGetCurrentContext()];  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();  UIGraphicsEndImageContext();    //儲存映像  NSString *path = [NSHomeDirectory() stringByAppendingFormat:@"/%d.png",index];  if ([UIImagePNGRepresentation(image) writeToFile:path atomically:YES]) {  index += 1;  NSLog(@"Succeeded! %@",path);  }  else {  NSLog(@"Failed!");  }  }  }