[英]Move a UIImageView in y axis
我正在開發應用程序,我只想在Y軸上移動UIImage,而不要在Xaxis上移動,這是我到目前為止所做的
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { stretchPoint = [[touches anyObject]locationInView:self.view]; arrowImage.center = stretchPoint; }
上面的代碼在兩個軸上都移動了arrowImage,stretchPoint是CGPoint的一個實例,我的應用程序處於縱向模式,任何人都可以給我一個基本的想法,因為arrowImage是UIImageView的一個實例。
子類化UIImage並實現以下代碼
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:[self superview]];
CGPoint newCenter = CGPointMake(self.center.x, currentPoint.y);
self.center = newCenter;
}
這應該工作正常:
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:self.view];
currentPoint.x = arrowImage.center.x;
arrowImage.center = currentPoint;
}
我不確定還沒有測試過,但是您可以執行以下操作:
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:self.view];
currentPoint.y = 20;
}
就像是:
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
stretchPoint = [[touches anyObject] locationInView:self.view];
arrowImage.frame = CGPointMake(arrowImage.origin.x,
stretchPoint.y,
arrowImage.size.width,
arrowImage.size.height);
}
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