- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    
    //初始化
    isSelected = NO;
    
    UIImageView *imageView;
    UIImage *image;
    int i;
    int x;//x座標
    int y;//y座標
    //建立觸發器
    
    
    for (i=0; i<9; i++) {
        image = [UIImage imageNamed:[NSString stringWithFormat:@"%d.jpg",i+1]];
        imageView = [[UIImageView alloc] initWithImage:image];
        //建立imageview座標
        x = (i%3)*102;
        y = (i/3)*152+2;
        imageView.frame = CGRectMake(x, y, 100, 150);
        //標記tag
        imageView.tag = i;
        //要早imageView上新增tag事件  必須設定 userInteractionEnabled 屬性值為YES 
        imageView.userInteractionEnabled = YES;
        UITapGestureRecognizer * tgr = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onClick:)];
        //在uiview上面新增觸發器
        [imageView addGestureRecognizer:tgr];
        //填充方式
        imageView.contentMode = UIViewContentModeScaleAspectFit;
        [self.view addSubview:imageView];
        [imageView release];
    }
    
}
 

-(void)onClick:(UIGestureRecognizer *)sender
{
    
    int i = sender.view.tag;
    
    
    for (UIImageView *imageView in self.view.subviews) {
        if (imageView.tag == i) {
            
            if (isSelected==NO) {
                imageView.frame = CGRectMake(0, 0, 320, 460);
               // imageView.contentMode = UIViewContentModeScaleAspectFill;
                imageView.center = self.view.center;
                //將點選的圖片放到最上層 會更改陣列的順序
                [self.view bringSubviewToFront:imageView];
                isSelected = YES;
            }else{
                imageView.frame = CGRectMake((i%3)*102, (i/3)*152+2, 100, 150);
                //imageView.contentMode = UIViewContentModeScaleToFill;
                isSelected = NO;
            }
        
        }
    }
    
    for(UIImageView *imageView in self.view.subviews){
        if (imageView.tag != i) {
            if (isSelected == YES) {
                imageView.hidden = YES;
            }else{
                imageView.hidden = NO;
            }
        }
    }
    
    



}