如何在移動ImageView時保持UIView內的imageview？

我有一個UIView主視圖控制器裏面包含1 imageview.i移動imageview與此方法。如何在移動ImageView時保持UIView內的imageview？

- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    UITouch *aTouch = [touches anyObject]; 
    if (aTouch.view == self.sub_View) { 
    CGPoint location = [aTouch locationInView:self.sub_View]; 
    CGPoint previousLocation = [aTouch previousLocationInView:self.sub_View]; 
    self.imageView.frame = CGRectOffset(self.imageView.frame, (location.x - previousLocation.x), (location.y - previousLocation.y)); 
    } 
}

Imageview move perfect。但是當我移動時，我必須保持UIView內的imageview。此代碼的問題是，當我移動ImageView時，它也移動到UIView之外。我必須保持UIView裏面的圖像和只能在UIView內移動。請幫我解決這個問題。如何爲imageview設置邊界，以便它只能在UIView內部移動。

來源

2016-04-19 Mitesh Dobareeya

是什麼self.sub_View –

它是主視圖一個UIView包含imageview的 –

試試下面的代碼。

- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    UITouch *aTouch = [touches anyObject]; 
    if (aTouch.view == self.sub_View) { 
    CGPoint location = [aTouch locationInView:self.sub_View]; 
    CGPoint previousLocation = [aTouch previousLocationInView:self.sub_View]; 
    CGRect newFrame = CGRectOffset(self.imageView.frame, (location.x - previousLocation.x), (location.y - previousLocation.y)); 
    if(newFrame.origin.x < 0) 
     newFrame.origin.x = 0; 
    if(newFrame.origin.y < 0) 
     newFrame.origin.y = 0; 
    if(newFrame.origin.x + newFrame.size.width > self.frame.size.width) 
     newFrame.origin.x = self.frame.size.width - self.imageView.frame.size.width; 
    if(newFrame.origin.y + newFrame.size.height > self.frame.size.height) 
     newFrame.origin.y = self.frame.size.height - self.imageView.frame.size.height; 

    self.imageView.frame = newFrame; 

    } 
}

來源

2016-04-19 10:46:23 Apurv

現在移動是在Uiview裏面，但是當我放大imageview它會重置imagevuew框架，當你滾動它將隱藏圖像。 –

你的意思是self.frame.size.width？ –

一）您可以設置UIView到YES

B的clipsToBounds屬性）可以使用休耕代碼，將您UIImageView

self.imageView.center = CGPointMake(MAX(0.0, MIN(location.x - previousLocation.x, self.sub_View.bounds.size.width)), MAX(0.0, MIN(location.y - previousLocation.y, self.sub_View.bounds.size.height)));

來源

2016-04-19 10:40:45

保持它的ImageView在左上角後imageview的逗留後第一個舉動。 –

如何在移動ImageView時保持UIView內的imageview？

回答

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