ios - UIImageView 不围绕中心旋转而是在整个地方跳跃

Question

我有一个测试罗盘 VC，带有众所周知的罗盘图像 (128 x 128)，中央坐标为 128,160。当我旋转 iPhone 时，指南针正确移动但到处乱跳。

我曾尝试从偏执狂中插入额外的代码以强制它保持在中心边界内，但似乎没有任何区别。

有什么想法吗？

呃

-(void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading*)newHeading {
    if (newHeading.headingAccuracy > 0) {    
        self.currentHeading = newHeading;    
        self.trueHeadingLabel.text = [NSString stringWithFormat:@"%d", (int)newHeading.trueHeading];    
        self.magneticHeadingLabel.text = [NSString stringWithFormat:@"%d", (int)newHeading.magneticHeading];    
        float heading = -((newHeading.magneticHeading*M_PI)/180.0f);    

        // Additional code to force image starts here
        self.arrowImage.frame = CGRectMake(128,160,128,128);    
        self.arrowImage.layer.anchorPoint = CGPointMake(0.5,0.5);    
        self.arrowImage.center = CGPointMake(160,160);   
        // Additional code to force image ends here

        self.arrowImage.transform = CGAffineTransformMakeRotation(heading);
    }
}

Answer 1

您是否尝试过将 View 的 anchor 设置到它的中心？这应该导致围绕中心而不是围绕(0,0)旋转。你可以尝试一些代码:

[自层].anchorPoint = CGPointMake(width/2, height/2);