在iOS中，当图像到达屏幕边缘时进行变换

我有10只萤火虫，我用下面的代码在屏幕上“飞翔”。 该代码还用于将萤火虫保持在屏幕上

- (void)viewDidLoad
{
    [super viewDidLoad];

NSArray *blueArray = [NSArray array];
blueArray = [[NSArray alloc] initWithObjects:
             [UIImage imageNamed:@"blue1.png"],
             [UIImage imageNamed:@"blue2.png"], nil];

blue.animationImages = blueArray;
blue.animationDuration = 0.20;
blue.animationRepeatCount = -1;
[blue startAnimating]; 

    bluepos =CGPointMake(2.0, 1.5);
}


-(void) someMethod {
    endingAnimationTimer = [NSTimer scheduledTimerWithTimeInterval:(0.03) target:self selector:@selector(makeFly) userInfo:nil repeats:YES];
}


-(void) makeFly {

    blue.center = CGPointMake(blue.center.x+bluepos.x, blue.center.y+bluepos.y);{
        if(blue.center.x > 480 || blue.center.x <0)
            bluepos.x = -bluepos.x;

        if(blue.center.y > 320 || blue.center.y <0)
            bluepos.y = -bluepos.y;
    }
}

英寸

 @synthesize blueIsFacingRight;


-(void) makeFly {

    blue.center = CGPointMake(blue.center.x+bluepos.x, blue.center.y+bluepos.y); {
        if(blue.center.x > 480 ) {
            if (blueIsFacingRight == YES) {
                blue.transform = CGAffineTransformMakeScale(-1, 1);
                blueIsFacingRight = NO;
            }
            bluepos.x = -bluepos.x;


        }

        if(blue.center.x <0) {
            bluepos.x = -bluepos.x;

            if (blueIsFacingRight == NO) {
                blue.transform = CGAffineTransformMakeScale(1, 1);
                blueIsFacingRight = YES;
            }
        }

        if(blue.center.y > 320 )
            bluepos.y = -bluepos.y;

        if( blue.center.y <0)
            bluepos.y = -bluepos.y;
    }
}

@IsFacingRight；
-（无效）makeFly{
blue.center=CGPointMake（blue.center.x+bluepos.x，blue.center.y+bluepos.y）{
如果（蓝色中心x>480）{
如果（blueIsFacingRight==是）{
blue.transform=CGAffineTransformMakeScale（-1,1）；
blueIsFacingRight=否；
}
bluepos.x=-bluepos.x；
}
如果（蓝色，中心x 320）
bluepos.y=-bluepos.y；
如果（blue.center.y在这两种情况下，您都将变换X值设置为-1。当其朝向右侧时，您应该像这样设置变换CGAffineTransformMakeScale（1，1）

blue.center=CGPointMake（blue.center.x+bluepos.x，blue.center.y+bluepos.y）{
如果（蓝色中心x>480）{
如果（blueIsFacingRight==是）{
blue.transform=CGAffineTransformMakeScale（-1,1）；
blueIsFacingRight=否；
}
bluepos.x=-bluepos.x；
}
如果（蓝色，中间.x
上面是我的makeFly方法，上面还有一堆其他东西，我正在反转图像，所以我在下次调用该方法时（0.03之后）撤消了更改

伙计，我觉得自己很傻
你说的对，复制粘贴让我上了那一张。但是，修复这一点并没有解决问题，图像仍然没有改变，请参见上面的编辑，UIImageView实际上是一个图像数组，所以看起来像fireflie的翅膀在拍打。它是一个数组会导致转换不起作用吗？
 @synthesize blueIsFacingRight;


-(void) makeFly {

    blue.center = CGPointMake(blue.center.x+bluepos.x, blue.center.y+bluepos.y); {
        if(blue.center.x > 480 ) {
            if (blueIsFacingRight == YES) {
                blue.transform = CGAffineTransformMakeScale(-1, 1);
                blueIsFacingRight = NO;
            }
            bluepos.x = -bluepos.x;


        }

        if(blue.center.x <0) {
            bluepos.x = -bluepos.x;

            if (blueIsFacingRight == NO) {
                blue.transform = CGAffineTransformMakeScale(1, 1);
                blueIsFacingRight = YES;
            }
        }

        if(blue.center.y > 320 )
            bluepos.y = -bluepos.y;

        if( blue.center.y <0)
            bluepos.y = -bluepos.y;
    }
}

blue.center = CGPointMake(blue.center.x+bluepos.x, blue.center.y+bluepos.y); {
if(blue.center.x > 480 ) {
    if (blueIsFacingRight == YES) {
        blue.transform = CGAffineTransformMakeScale(-1, 1);
        blueIsFacingRight = NO;
    }
    bluepos.x = -bluepos.x;


}

if(blue.center.x <0) {
    bluepos.x = -bluepos.x;

    if (blueIsFacingRight == NO) {
        blue.transform = CGAffineTransformMakeScale(1, 1);
        blueIsFacingRight = YES;
    }
}

**blue.transform =CGAffineTransformIdentity;**