- (UIImage *)snapshotView {
UIGraphicsBeginImageContextWithOptions(CGSizeMake(FBScreenW, FBScreenH - FBNavigationBarH), NO, [UIScreen mainScreen].scale);
CGContextRef currentContext = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(currentContext, 0, 0);
[self.viewController.view.layer renderInContext:currentContext];
UIImage *snapshotImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageView *snapshotView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, FBScreenW, FBScreenH - FBNavigationBarH)];
UIEdgeInsets snapshotEdgeInsets = UIEdgeInsetsZero;
snapshotView.image = [snapshotImage resizableImageWithCapInsets:snapshotEdgeInsets];
return snapshotView.image;
}
- (void)composeImg {
UIImage *img = [UIImage imageNamed:@"image_forUse_image1"];
CGImageRef imgRef = img.CGImage;
CGFloat w = FBScreenW;
CGFloat h = w / 2;
//以1.png的图大小为底图
UIImage *img1 = [self snapshotView];
CGImageRef imgRef1 = img1.CGImage;
CGFloat w1 = FBScreenW;
CGFloat h1 = FBScreenH;
//以1.png的图大小为画布创建上下文
UIGraphicsBeginImageContext(CGSizeMake(w1, h1));
[img1 drawInRect:CGRectMake(0, 0, w1, h1 - FBNavigationBarH)];//先把1.png画到上下文中
[img drawInRect:CGRectMake(0, h1 - h, w, h)];//再把小图放在上下文中
UIImage *resultImg = UIGraphicsGetImageFromCurrentImageContext();//从当前上下文中获得最终图片
UIGraphicsEndImageContext();//关闭上下文
NSString *path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
NSString *filePath = [path stringByAppendingPathComponent:@"01.jpg"];
[UIImagePNGRepresentation(resultImg) writeToFile:filePath atomically:YES];//保存图片到沙盒
NSLog(@"%@", FBDocument);
CGImageRelease(imgRef);
CGImageRelease(imgRef1);
}
