Objective c MKAnnotationView带旋转的图像

我想将

UIView

添加到

MKAnnotationView

作为图像。但首先我想按度数旋转

UIView

，然后将新的

UIImage

添加到

UIView

。你能帮助我吗？我试过了，但视图从未旋转过

UIView *pinView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 63, 63)];
pinView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"IconMapPin"]];
pinView.transform = CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(self.heading));

UIImage *pinImage = [self imageFromUIView:pinView];    
annotationView.image = pinImage;

方法将UIView转换为UIImage

- (UIImage *) imageFromUIView:(UIView*)view
{
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return image;
}

去掉这个,

pinView.transform = CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(self.heading));

加上这个,

pinImage.transform = CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(self.heading));

此后,

UIImage *pinImage = [self imageFromUIView:pinView]; 

所以最后的代码是

UIView *pinView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 63, 63)];
pinView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"IconMapPin"]];


UIImage *pinImage = [self imageFromUIView:pinView]; 
pinImage.transform = CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(self.heading));
annotationView.image = pinImage;