2012-07-12 136 views
0

我有一个图像作为子视图的滚动视图。我想将scrollview的边界设置为图像视图的大小,以便您无法看到任何背景。设置视图边界

enter image description here

我不希望这种情况发生了。

奇怪的是,在你放大或缩小图像后,边界似乎会自行修复,而且你不能再移动图像并看到背景。

这就是我要去下面的代码:

-(UIView *) viewForZoomingInScrollView:(UIScrollView *)scrollView 
{ 
    // return which subview we want to zoom 
    return self.imageView; 
} 


-(void)viewDidLoad{ 

    [super viewDidLoad]; 

    [self sendLogMessage:@"Second View Controller Loaded"]; 

    //sets the initial view to scale to fit the screen 
    self.imageView.frame = CGRectMake(0, 0, CGRectGetWidth(self.view.bounds), CGRectGetHeight(self.view.bounds)); 

    //sets the content size to be the size our our whole frame 
    self.scrollView.contentSize = self.imageView.image.size; 

    //setes the scrollview's delegate to itself 
    self.scrollView.delegate = self; 

    //sets the maximum zoom to 2.0, meaning that the picture can only become a maximum of twice as big 
    [self.scrollView setMaximumZoomScale : 2.5]; 

    //sets the minimum zoom to 1.0 so that the scrollview can never be smaller than the image (no matter how far in/out we're zoomed) 
    [self.scrollView setMinimumZoomScale : 1.0]; 

    [imageView addSubview:button]; 

} 

我认为,这条线将解决我的问题

//sets the content size to be the size our our whole frame 
self.scrollView.contentSize = self.imageView.image.size; 

但就像我说的,这只是在我放大或缩小的作品。


编辑:当我切换

self.scrollView.contentSize = self.imageView.image.size;

self.scrollView.frame = self.imageView.frame; 

它就像我希望它(你看不到的背景),在工具栏上除顶部被图像覆盖。

回答

0

为了解决这个问题,我最终宣布新的CGRect,将其原点设置为我的scrollView的原点,将其大小设置为我的视图的边界,然后将此CGRect分配回我的滚动视图框架

CGRect scrollFrame; 
scrollFrame.origin = self.scrollView.frame.origin; 
scrollFrame.size = CGSizeMake(CGRectGetWidth(self.view.bounds), CGRectGetHeight(self.view.bounds)); 
self.scrollView.frame = scrollFrame; 
1

imageView.image.size不一定是ImageView的本身的框架,尝试设置 scrollview.frame = imageView.frame

然后

scrollView.contentSize = imageView.image.size

然后,你将不会看到任何边界。如果你想要的形象是开始使用的最大尺寸, 做

imageView.frame = image.size;

[imageView setImage:image];

scrollView.frame = self.view.frame; //or desired size

[scrollView addSubView:imageView];

[scrollView setContentSize:image.size]; //or imageView.frame.size