在iOS上使用动画将UIImageView旋转180度以上 [英] Rotating UIImageView more than 180 degrees using animations on iOS

问题描述

我正在尝试通过将移动的仪表旋转180度以上来为其设置动画，但是无法正常工作.我使用 CGAffineTransform 旋转电表，电表使用净结果进行旋转.这意味着使用此功能时，我无法选择CW或CCW旋转.如何修改此代码以使其旋转4弧度.当前，旋转被转换为最终结果，从而使旋转最小.

Im trying to animate a moving meter by rotating it more than 180 degrees, but it wont work. Im using CGAffineTransform to rotate the meter, which uses a net result to make the rotation. This means that i cannot choose CW or CCW rotation when using this function. How can I modified this code to make it rotate 4 radians. Currently the rotation is transformed to a net result, making the rotation minimal.

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:1.25]; 
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
CGAffineTransform transform = CGAffineTransformMakeRotation(4);
self.meter.transform = transform;
[UIView commitAnimations];

从答案中，我设法做到了这一点

From the answers i managed to get it working by doing this

 [UIView animateWithDuration:1.5 animations:^{
    CABasicAnimation *fullRotation;
    fullRotation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
    fullRotation.fromValue = [NSNumber numberWithFloat:0];
    fullRotation.toValue = [NSNumber numberWithFloat:((330*M_PI)/180)];
    fullRotation.duration = 2.0f;
    fullRotation.repeatCount = 1;
    fullRotation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    fullRotation.fillMode = kCAFillModeForwards;
    fullRotation.removedOnCompletion = NO;

    // add animation in your view
    [self.meter.layer addAnimation:fullRotation forKey:@"330"];
    [self performSelector:@selector(stopRotate:) withObject:self.meter afterDelay:2.0];
}];

推荐答案

///在标头前缀中添加

//Add This in header prefix

 #define MAXFLOAT    0x1.fffffep+127f

//添加旋转

 [UIView animateWithDuration:1.5 animations:^{
      CABasicAnimation *fullRotation;
    fullRotation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
    fullRotation.fromValue = [NSNumber numberWithFloat:0];
    fullRotation.toValue = [NSNumber numberWithFloat:(2*M_PI))];
    fullRotation.duration =1.0f;
    fullRotation.repeatCount = MAXFLOAT;
    // add animation in your view
    [yourView.layer addAnimation:fullRotation forKey:@"360"];
    [self performSelector:@selector(stopRotate:) withObject:yourView afterDelay:1.0];
}];

并添加此代码以停止从视图中旋转

And Add this code to stop rotation From view

-(void)stopRotate :(UIView *)yourView
{
  [yourView.layer removeAnimationForKey:@"360"];
}

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