MKAnnotationView 图像旋转答案

【问题标题】：MKAnnotationView image with rotationMKAnnotationView 图像旋转
【发布时间】：2015-07-10 06:54:37
【问题描述】：

我想将UIView 添加到MKAnnotationView 作为图像。但首先我想按度旋转UIView，然后将新的UIImage 添加到UIVIew。你能帮助我吗？我试过了，但 UIView 从不旋转。

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;
}

【问题讨论】：

标签： objective-c uiview rotation uiimage mkannotationview

【解决方案1】：

删除这个，

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

添加这个，

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

之后，

UIImage *pinImage = [self imageFromUIView:pinView];

所以最终的代码将是，

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;

【讨论】：