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目前我正在使用以下代码来旋转我的图像

- (void)myImageRotate:(UIRotationGestureRecognizer *)gesture
{
     if(arr==nil)
        {
            arr=[[NSMutableArray alloc] init ];
        }

     if ([gesture state] == UIGestureRecognizerStateBegan || [gesture state] == UIGestureRecognizerStateChanged) 
        {
            currentRotation =(float) [gesture rotation];

        self.transform=CGAffineTransformRotate(self.transform,currentRotation);
        [gesture setRotation:0];
        [arr addObject:[NSNumber numberWithFloat:currentRotation]]; 
    }
    NSLog(@"Rotation Value: %f", currentRotation);

//现在我将所有旋转值保存到一个数组并执行反向数组并获取 //最后一个旋转值

NSArray *reversedArray = [[arr reverseObjectEnumerator] allObjects];
NSLog(@"Array: %@", arr);
NSLog(@"Reversed Array: %@", reversedArray);

//现在显示的反转数组始终以 0.0 开头......无论可能是旋转反转数组的值如何：( 0, 0, "0.001174212", "0.006030798", "0.01210225", "0.01215386", "0.01220191 ", "0.01224673", "0.006139159", "0.006149054", "0.01850212", "0.01237607", )

lastRotationValue = 0.0;
for (NSString* stringValue in [arr reverseObjectEnumerator]) {
    double value = [stringValue doubleValue];
    if (value != 0.0) {

        //Note: 1 degree=0.0174532925 radian

        lastRotationValue = value;
        break;
    }
}

if (lastRotationValue != 0.0) {
    NSLog(@"My firstNonZeroValue of Rotation Degree:%f",lastRotationValue);
}
}

现在我将最后一个旋转值写入一个 xml 文件，关闭并重新启动应用程序我能够从 XML 文件中读取最后一个精确值。

但是由于最后的旋转值不是实际的旋转值，图像并没有完美地旋转到最后的状态。

所以我也尝试过放置硬编码值和完美旋转的图像。

self.transform = CGAffineTransformMakeRotation(1.57);//By 90 Degree

那么获得图像精确旋转值的解决方案应该是什么。

4

1 回答 1

1

试试这个

在 .h 中放这个东西浮动角度；

-(void)viewDidLoad
{
[super viewDidLoad];

UIRotationGestureRecognizer *recognizer = [[[UIRotationGestureRecognizer alloc]                                          initWithTarget:self                                        action:@selector(handleRotate:)] autorelease];

[self.rotatedView addGestureRecognizer:recognizer];

}
- (void)handleRotate:(UIRotationGestureRecognizer *)recognizer {
    // current value is past rotations + current rotation
    float rotation = angle + -recognizer.rotation;  
    self.rotatedView.transform = CGAffineTransformMakeRotation(-rotation);

    // once the user has finsihed the rotate, save the new angle
    if (recognizer.state == UIGestureRecognizerStateEnded) {
        angle = rotation;

        NSLog(@"Last Rotation: %f",angle);
    }
}
于 2011-11-15T19:26:47.850 回答