小编Chr*_*isM的帖子

我试图找到2个数字范围的交集,例如...

范围A为10至100,范围B为60至70

有没有写一个if语句来计算两个范围的交集的简单方法,所以在这个例子中它将是10.

谢谢,

是否可以使用以下方法在地图视图上创建不同的彩色多边形？

-(MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id )overlay{

如果我有2个多边形,我可以设置一个为红色,另一个为黄色？

我试图UIView使用CAKeyframeAnimation跟随创建的路径的圆形动画CGPathAddEllipseInRect,我已经设置好了.但是,有没有办法设置动画的开始位置？我的代码是:

//set up animation
CAKeyframeAnimation *pathAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
pathAnimation.calculationMode = kCAAnimationPaced;
pathAnimation.fillMode = kCAFillModeForwards;
pathAnimation.removedOnCompletion = NO;
pathAnimation.duration = 10.0;
pathAnimation.repeatCount = 1000;
CGMutablePathRef curvedPath = CGPathCreateMutable();

//path as a circle
CGRect bounds = CGRectMake(60,170,200,200);
CGPathAddEllipseInRect(curvedPath, NULL, bounds);

//tell animation to use this path
pathAnimation.path = curvedPath;
CGPathRelease(curvedPath);

//add subview
circleView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"ball.png"]];    
[testView addSubview:circleView];

//animate
[circleView.layer addAnimation:pathAnimation forKey:@"moveTheSquare"];