UIScrollView中的奇怪UIImageView [英] Strange UIImageView in UIScrollView

问题描述

非常奇怪的行为，使用此代码在屏幕中央有一个圆点，并且在笔尖内部没有任何内容的UIScrollview。我希望UIScrollview应该是空的。当我滚动屏幕时，点模糊并消失。

Very strange behavior, there is a round dot in the center of the screen using this code, and a UIScrollview with nothing inside in a nib. I expect that UIScrollview should be empty. The dot blurs and disappears when I scroll the screen.

- (void)viewDidLoad {
    [super viewDidLoad];
    NSArray *subviews = [closetScroll subviews];
    UIImageView *strange=[subviews objectAtIndex:0];
    strange.center = CGPointMake([[UIScreen mainScreen] bounds].size.width/2, [[UIScreen mainScreen] bounds].size.height/2);
    strange.alpha=1;

    NSLog(@"%@",subviews);
}

控制台输出为：

<UIImageView: 0x4b1f780; frame = (380.5 508.5; 7 7); opaque = NO; autoresize = LM; userInteractionEnabled = NO; layer = <CALayer: 0x4b1f820>

有谁知道为什么？

推荐答案

放大UIImageView并调整配置后，我得出结论，UIImageView实际上是滚动条，如果启用水平和垂直滚动，空UIScrollview里面有两个子视图。

After magnifying the UIImageView and tweaking with configurations, I have come to conclude that the UIImageView is actually the scroll bar, and if horizontal and vertical scroll is enabled, an "empty" UIScrollview has two subviews inside.

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