:-)、StackOverflowのにないようにコンパイラにこれを入力した私は解決策を見つけました私の質問
この
- (UIImage*)upsideDownBunny:(CGFloat)radians withImage:(UIImage*)testImage {
__block CGImageRef cgImg;
__block CGSize imgSize;
__block UIImageOrientation orientation;
dispatch_block_t createStartImgBlock = ^(void) {
// UIImages should only be accessed from the main thread
UIImage *img =testImage
imgSize = [img size]; // this size will be pre rotated
orientation = [img imageOrientation];
cgImg = CGImageRetain([img CGImage]); // this data is not rotated
};
if([NSThread isMainThread]) {
createStartImgBlock();
} else {
dispatch_sync(dispatch_get_main_queue(), createStartImgBlock);
}
CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();
// in iOS4+ you can let the context allocate memory by passing NULL
CGContextRef context = CGBitmapContextCreate(NULL,
imgSize.width,
imgSize.height,
8,
imgSize.width * 4,
colorspace,
kCGImageAlphaPremultipliedLast);
// rotate so the image respects the original UIImage's orientation
switch (orientation) {
case UIImageOrientationDown:
CGContextTranslateCTM(context, imgSize.width, imgSize.height);
CGContextRotateCTM(context, -radians);
break;
case UIImageOrientationLeft:
CGContextTranslateCTM(context, 0.0, imgSize.height);
CGContextRotateCTM(context, 3.0 * -radians/2.0);
break;
case UIImageOrientationRight:
CGContextTranslateCTM(context,imgSize.width, 0.0);
CGContextRotateCTM(context, -radians/2.0);
break;
default:
// there are mirrored modes possible
// but they aren't generated by the iPhone's camera
break;
}
// rotate the image upside down
CGContextTranslateCTM(context, +(imgSize.width * 0.5f), +(imgSize.height * 0.5f));
CGContextRotateCTM(context, -radians);
//CGContextDrawImage(context, CGRectMake(0.0, 0.0, imgSize.width, imgSize.height), cgImg);
CGContextDrawImage(context, (CGRect){.origin.x = -imgSize.width* 0.5f , .origin.y = -imgSize.width* 0.5f , .size.width = imgSize.width, .size.height = imgSize.width}, cgImg);
// grab the new rotated image
CGContextFlush(context);
CGImageRef newCgImg = CGBitmapContextCreateImage(context);
__block UIImage *newImage;
dispatch_block_t createRotatedImgBlock = ^(void) {
// UIImages should only be accessed from the main thread
newImage = [UIImage imageWithCGImage:newCgImg];
};
if([NSThread isMainThread]) {
createRotatedImgBlock();
} else {
dispatch_sync(dispatch_get_main_queue(), createRotatedImgBlock);
}
CGColorSpaceRelease(colorspace);
CGImageRelease(newCgImg);
CGContextRelease(context);
return newImage;
}
するための方法の下にこれを使用します
コール今、我々は回転状態を保存することができます
360に0の間で回転がsliderValueある
UIImage *rotated2 = [self upsideDownBunny:rotation];
と、この方法。
ダーシャンに感謝しています。 – AJPatel
それは完璧に動作することを聞いていいです.Thaks – darshan