UIRotationGestureRecognizer上的UIImageView

Question

如何有兩個fingure觸摸iOS中SDK..as我知道這是很簡單的，但因爲我在這個技術很新，所以無法理解旋轉的UIImageView ...

如何使用UIRotationGestureRecognizer來執行此...

請幫我解決這個問題...

謝謝。

Answer 1

代碼這個觀點上沒有負載或ImageView的創建功能：m_ctrlImgVwShowImage - 你的imageview的

UIRotationGestureRecognizer *rotationRecognizer = [[[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotate:)] autorelease]; 
    [rotationRecognizer setDelegate:self]; 
    [m_ctrlImgVwShowImage addGestureRecognizer:rotationRecognizer]; 

//lastRotation is a cgfloat member variable 

-(void)rotate:(id)sender { 
    if([(UIRotationGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) { 
     _lastRotation = 0.0; 
     return; 
    } 

    CGFloat rotation = 0.0 - (_lastRotation - [(UIRotationGestureRecognizer*)sender rotation]); 

    CGAffineTransform currentTransform = m_ctrlImgVwShowImage.transform; 
    CGAffineTransform newTransform = CGAffineTransformRotate(currentTransform,rotation); 

    [m_ctrlImgVwShowImage setTransform:newTransform]; 

    _lastRotation = [(UIRotationGestureRecognizer*)sender rotation]; 
}