点位置判断

 

a. 判断点是否再某MutablePathRef路径里

- (void)viewDidLoad {
    [super viewDidLoad];

    CGMutablePathRef pathRef=CGPathCreateMutable();
    CGPathMoveToPoint(pathRef, NULL, 4, 4);
    CGPathAddLineToPoint(pathRef, NULL, 4, 8);
    CGPathAddLineToPoint(pathRef, NULL, 10, 4);
    CGPathAddLineToPoint(pathRef, NULL, 4, 4);
    CGPathCloseSubpath(pathRef);

    CGPoint point=CGPointMake(5,7);
    CGPoint outPoint=CGPointMake(5,10);

    if (CGPathContainsPoint(pathRef, NULL, point, NO)) {
        NSLog(@"point in path!");
    }

    if (!CGPathContainsPoint(pathRef, NULL, outPoint, NO)) {
        NSLog(@"outPoint out path!");
    }

b.touch移动事件，是移动到当前视图的子视图中，还是移动到当前视图以外了

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ 
    UITouch *touch=[touches anyObject]; 
    if (![self pointInside:[touch locationInView:self] withEvent:nil]) { 
        NSLog(@"touches moved outside the view"); 
    }else { 
        UIView *hitView=[self hitTest:[[touches anyObject] locationInView:self] withEvent:nil]; 
        if (hitView==self) { 
            NSLog(@"touches moved in the view"); 
        }else{ 
            NSLog(@"touches moved in the subview"); 
        } 
    } 
}

c.

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 

{

　　UITouch *touch = [[event allTouches] anyObject];
　　CGPoint location = [touch locationInView:touch.view];
}