ios - 缩放和 ScrollView

Question

当我缩放 View 时，滚动不起作用。
如何解决这个问题？谢谢。

- (void)viewDidLoad
{
[super viewDidLoad];

NSInteger count = 10;
NSInteger w = self.view.bounds.size.width;
NSInteger h = self.view.bounds.size.height;

UIScrollView* zoomCanvas;
UIScrollView* scrollCanvas;

zoomCanvas = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, w, h)];
[zoomCanvas setMinimumZoomScale:1.0];
[zoomCanvas setMaximumZoomScale:2.0];
[zoomCanvas setDelegate:self];

scrollCanvas = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, w, h)];
[scrollCanvas setContentSize:CGSizeMake(w, h*count)];

srand(time(NULL));
for (int i=0; i<count; i++) {
    UIView* view = [[UIView alloc] initWithFrame:CGRectMake(0, h*i, w, h)];
    view.backgroundColor = [UIColor colorWithRed:rand() % 255 / 255.0 green:rand() % 255 / 255.0 blue:rand() % 255 / 255.0 alpha:1.0];
    [scrollCanvas addSubview:view];
}

[zoomCanvas addSubview:scrollCanvas];
[self.view addSubview:zoomCanvas];
}

- (UIView*)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
    return [[scrollView subviews] objectAtIndex:0];
}

当我缩放 View 时，滚动不起作用。
如何解决这个问题？谢谢。

Answer 1

如果您正在谈论在缩放 Canvas 中滚动，那可能是因为您没有设置其内容大小。