Question

有没有办法找到屏幕的endpoint？让我们说一个大小（100x100）的屏幕的中点位于（50，）和起点（0，），端点为（100，）。我可以根据设备屏幕大小来硬编码以获得终点，但这可能是基于假设的过多工作。

我正在制作基于UIView的自定义UIBezierPath动画。

以下是我要做的事情：

正如您所看到的，动画在到达某个点后停止了。我希望这一点成为屏幕的结尾，以便UIView涵盖整个screen。为了更清楚，我将UIView拖到A点，然后它动画到B点（终点，所以B＆gt; A）

我不知道如何计算B，所以当我将UIView拖到A时，它会动画到屏幕的末尾（屏幕的终点）。

以下是更好理解的代码：

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLocation = [touch locationInView:self.dragView];

 if (touchLocation.x<250) {

        if (!startBackSlide) {
             _circleDragView.touchdragPoint=touchLocation.y;
            _circleDragView.dragToPoint=CGPointMake(touchLocation.x+40, touchLocation.y);
            [_circleDragView setNeedsDisplay];
            _savedPoint=touchLocation;
        }else{

            //move the top and bot points backwards along with slide
            [self animateCOmpleteBezier:touchLocation];

            _circleDragView.touchdragPoint=touchLocation.y;
            _circleDragView.dragToPoint=CGPointMake(touchLocation.x+54, touchLocation.y);
            [_circleDragView setNeedsDisplay];
            _savedPoint=touchLocation;

            if (touchLocation.x<20) {
                startBackSlide=NO;
                snapped=YES;
            }
        }

    }

    if (touchLocation.x>=250) {

        if (snapped) {
            snapped=NO;
            //move the top and bottom points to the specified point(In this case the end point)
        }

    }

}

-(void)animateCOmpleteBezier:(CGPoint) value{

    [UIView animateWithDuration:0.01 delay:0  options:UIViewAnimationOptionCurveEaseOut animations:^{
        _circleDragView.topWidthPoint=value.x-10;
        _circleDragView.botWidthPoint=value.x-10;
        [_circleDragView setNeedsDisplay];

    } completion:^(BOOL finished) {

    }];


}

Answer 1

屏幕的终点等于它的宽度和高度：

CGSize screenSize = [UIScreen mainScreen].bounds.size;
CGPoint endPoint = CGPointMake(screenSize.width, screenSize.height);

https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIScreen_Class/#//apple_ref/occ/instp/UIScreen/bounds

如何获得屏幕的最终CGPoint？

1 个答案: