小编joh*_*icz的帖子

我想对UIImageView缩放,旋转进行2次操作,我有2个问题:

答:我为ex做了缩放操作.当我尝试进行旋转时,将UIImageView其设置为初始大小,我想知道如何保持缩放UIImageView并从缩放图像进行旋转.

B.我想将缩放操作与旋转相结合,我不知道如何实现这一点:

- (void)viewDidLoad 
{
    foo = [[UIImageView alloc]initWithFrame:CGRectMake(100.0, 100.0, 600, 800.0)];
    foo.userInteractionEnabled = YES;
    foo.multipleTouchEnabled  = YES;
    foo.image = [UIImage imageNamed:@"earth.jpg"];
    foo.contentMode = UIViewContentModeScaleAspectFit;
    foo.clipsToBounds = YES;

    [self.view addSubview:foo];
}

//---pinch gesture--- 
UIPinchGestureRecognizer *pinchGesture =
[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinchGesture:)];
[foo addGestureRecognizer:pinchGesture]; 
[pinchGesture release];

//---rotate gesture--- 
UIRotationGestureRecognizer *rotateGesture =
[[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(handleRotateGesture:)];
[foo addGestureRecognizer:rotateGesture]; 
[rotateGesture release];

//---handle pinch gesture--- 
-(IBAction) handlePinchGesture:(UIGestureRecognizer *) sender {
    NSLog(@"Pinch");
    CGFloat factor = [(UIPinchGestureRecognizer *) …

我想在一个代表手表数字的圆圈中绘制12个图像,我已经阅读了有关具有透明边框的图像的stackoverflow上的所有主题,但它在我的情况下不起作用

-(UIImage *)addImageNumber_:(UIImage *)img {

    int w = img.size.width;
    int h = img.size.height;

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
    CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
    CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 1);
    CGContextSetShouldAntialias(context,YES);
    CGContextSetAllowsAntialiasing( context ,YES );
    CGAffineTransform transform;

    for (int x=0; x<=11; x++) {

        UIImage *timg1 = [UIImage imageNamed:@"2.png"];

        CGRect imageRect = CGRectMake(0, 0, timg1.size.width+2, timg1.size.height+2);
        UIGraphicsBeginImageContext(imageRect.size);
        [timg1 drawInRect:CGRectMake(1,1,timg1.size.width,timg1.size.height)];
        timg1 = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();

        transform = CGAffineTransformIdentity;

        CGContextDrawImage(context, CGRectMake((w-26)/2, 0, 26, 30), …