如何在xcode中使用动画时找到两个相交/不相交的对象？

Question

我正在寻找两个物体的交点。我正在使用基本动画代码移动两个Image1，一个是左边的形式 - ＆gt;对＆amp; Image2表单底部 - ＆gt; top.t这个动作将在你长按屏幕（任何地方）时执行。

可以帮助我找出如何找到两者相交/不相交。我只想在两者相交时显示警示。

这是我的代码..

-(IBAction)gesture_action:(UILongPressGestureRecognizer *)gesture
{
    if(gesture.state == UIGestureRecognizerStateBegan) {
        [self first];
        [self colide:gesture];
    } else if(gesture.state == UIGestureRecognizerStateChanged) {
        NSLog(@"middle");
    } else if(gesture.state == UIGestureRecognizerStateEnded) {
        NSLog(@"end”);
    }
}

-(BOOL)dragIsOverTrash:(UILongPressGestureRecognizer *)gesture
{
    CGPoint pointInTrash =[gesture locationInView:self.image1];
    return [self.image1 pointInside:pointInTrash withEvent:nil];
}


-(void)colide:(UILongPressGestureRecognizer *)gesture
{
    if ([self dragIsOverTrash:gesture]){
        NSLog(@" hitted the cloud ");
    } else {
        NSLog(@" not hited ");
    }
}

-(void)first
{
    [UIView animateWithDuration:4
                     animations:^{
                        image2.frame=CGRectMake(106,5,108,128);
                     } 
                     completion:nil];

    [UIView animateWithDuration:5
                     animations:^{
                         image1.frame=CGRectMake(-250,25,240,128);
                     } 
                     completion:nil];

}

我的结果：----

PLZ建议是否还有其他更好的方法......来解决这个问题。 谢谢你的时间，我感谢你的帮助。 :)

Answer 1

HI伙计经过长时间的工作，我的伙伴的帮助，我终于做到了。这里是解决这个问题的代码..使用计时器。然后你可以很容易地找到结果。

   -(void)callthismethod

   {

    CALayer *layer = image1.layer.presentationLayer;
    CGRect NewObjectFrame =  layer.frame;
    CALayer *layer2 = image2.layer.presentationLayer;
    CGRect SprintFrame = layer2.frame;

    if (CGRectIntersectsRect(NewObjectFrame, SprintFrame)) 
    {

        NSLog(@"Colided");
    }
 }

谢谢我的朋友帮助我再次解决这个问题：）

Answer 2

在做了一些改变之后，我得到了不同的解决方案希望可以帮助你： -

.h文件

#import <UIKit/UIKit.h>

@interface animationViewController : UIViewController
{
    UIImageView *square4;
    UIImageView *square3;
}

@end

.m文件

- (void)viewDidLoad
{

    float frameWidth=320;
    float frameHeight=480;


    square4 = [[UIImageView alloc] initWithFrame: CGRectMake(frameWidth/10, frameHeight/1.35, frameWidth*.1, frameWidth*.1)];
    square4.image = [UIImage imageNamed: @"square.jpg"];
    [self.view addSubview: square4];
    CGPoint origin4 = square4.center;
    CGPoint target4 = CGPointMake(square4.center.x+300, square3.center.y);
    CABasicAnimation *bounce4 = [CABasicAnimation animationWithKeyPath:@"position.x"];
    bounce4.fromValue = [NSNumber numberWithInt:origin4.x];
    bounce4.toValue = [NSNumber numberWithInt:target4.x];
    bounce4.duration = 0.5;
    bounce4.repeatCount = HUGE_VALF;
    bounce4.autoreverses = YES;
    [square4.layer addAnimation:bounce4 forKey:@"position"];




    square3 = [[UIImageView alloc] initWithFrame: CGRectMake(frameWidth/10, frameHeight/1.35, frameWidth*.1, frameWidth*.1)];
    square3.image = [UIImage imageNamed: @"square.jpg"];
    [self.view addSubview: square3];
    CGPoint origin3 = square3.center;
    CGPoint target3 = CGPointMake(square3.center.x+300, square4.center.y);
    CABasicAnimation *bounce3 = [CABasicAnimation animationWithKeyPath:@"position.y"];
    bounce3.fromValue = [NSNumber numberWithInt:origin3.x];
    bounce3.toValue = [NSNumber numberWithInt:target3.x+50];
    bounce3.duration = 1.3;
    bounce3.repeatCount = HUGE_VALF;
    bounce3.autoreverses = YES;
    [square3.layer addAnimation:bounce3 forKey:@"position"];

    [super viewDidLoad];


    [NSTimer scheduledTimerWithTimeInterval: 0.5
                                     target: self
                                   selector: @selector(checkCollision:)
                                   userInfo: nil
                                    repeats: YES];


}


-(void) checkCollision: (NSTimer *) theTimer{


    if(CGRectIntersectsRect(((CALayer*)square3.layer.presentationLayer).frame,
                           ((CALayer*)square4.layer.presentationLayer).frame)) {
        //handle the collision
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"wow!"
                                                        message:@"detect Failed!"
                                                       delegate:self
                                              cancelButtonTitle:@"OK"
                                              otherButtonTitles:nil];
        [alert show];
        NSLog(@"detect hit");

    }

}

它的输出如下： -

对于我正在使用NStimer的测试，您可以修改为您的要求希望这可以帮助您。