使用UIRotationGestureRecognizer以固定（任意方向）角度旋转UIView？

Question

Guyz ......我被一个愚蠢的问题困扰了......

我可以使用UIRotationGestureRecognizer旋转我的UIView，但只想在任意方向上以固定角度（例如45度）旋转它，考虑阈值（recognizer.rotation）。

请帮助我......提前致谢....

：）

Answer 1

此代码段适用于我

-(void)doAction:(UIRotationGestureRecognizer *)recognizer {
    if ([recognizer state] == UIGestureRecognizerStateEnded){

    float RotationinDegrees = recognizer.rotation * (180/M_PI);
    NSLog(@"Rotation %f",RotationinDegrees);
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:.3];
    if (RotationinDegrees>thresholdValue) {
        self.transform = CGAffineTransformRotate([self transform], DEGREES_TO_RADIANS(desiredangle));
    }
    [UIView commitAnimations];
    [recognizer setRotation:0];
}       

}