我该如何设置UIScrollView的起始点?我想在UIScrollView左侧添加一个UIImageView,但是只更改contentSize会在scrollview右侧添加滚动空间。我该如何在scrollView的(0,0)点左侧添加一个ImageView并使其成为scrollView内容大小的一部分?
我该如何设置UIScrollView的起始点?我想在UIScrollView左侧添加一个UIImageView,但是只更改contentSize会在scrollview右侧添加滚动空间。我该如何在scrollView的(0,0)点左侧添加一个ImageView并使其成为scrollView内容大小的一部分?
UIScrollView *scroller = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
scroller.delegate = self;
scroller.pagingEnabled = YES;
scroller.backgroundColor = [UIColor blueColor];
scroller.contentSize = CGSizeMake(960, 480);
UIView *imgView = [[UIView alloc] initWithFrame:CGRectMake(320, 0, 320, 480)];
[imgView setBackgroundColor:[UIColor redColor]];
[scroller addSubview:imgView];
[scroller setContentOffset:CGPointMake(320, 0)];
[self.view addSubview:scroller];
这有帮助吗?
[scroller setContentOffset:CGPointMake(320, 0)];
[self.view addSubview:scroller];
同时适用于iPad
[scroller setContentOffset:CGPointMake(1024, 0)];
[self.view addSubview:scroller];
[scrollView setContentOffset:CGPointMake(320, 0.0)];
设置起点的关键是将具有不为零的xy坐标的边界分配给它。就像这样
lazy var contentView: UIView = {
let size = CGFloat(5000)
let view = UIView(frame: CGRectZero)
view.frame = CGRectMake(0, 0, size, size)
view.bounds = CGRectMake(-size/2, -size/2, size, size)
return view
}()
func centerContent() {
let frame = UIEdgeInsetsInsetRect(self.scrollView.bounds, self.scrollView.contentInset)
let navigationBarHeight = self.scrollView.contentInset.top
let x = (self.scrollView.contentSize.width/2) - (frame.size.width/2)
let y = (self.scrollView.contentSize.height/2) - (frame.size.height/2) - navigationBarHeight
self.scrollView.contentOffset = CGPointMake(x, y)
}
如果您只是想在开始时设置滚动内容的位置,可以使用- (void)setContentOffset:(CGPoint)contentOffset animated:(BOOL)animated
方法来将内容滚动到指定的点。
如果这不是您想知道的,请告诉我,我会回复您!
祝好。