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更改 UIScrollView 中每个 UILabel 的颜色

发布于 2024-12-02 05:27:54 字数 74 浏览 0 评论 0原文

是否可以循环遍历 UIScrollview 中的所有 UILabel 并更改颜色？

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独自←快乐 2024-12-09 05:27:54

假设它们都是滚动视图的子视图（第一级子视图），而不是其中的容器视图...

for(UIView *subview in theScrollView.subviews)
    if([subview isKindOfClass:[UILabel class]])
        [(UILabel *)subview setTextColor:[UIColor whateverColor]];

如果标签位于滚动视图内的其他视图内，则必须递归到每个子视图并做同样的事情，但这只是上面的一个非常简单的步骤。例子：

- (void)recolorLabelSubviews:(UIView *)view
{
    for(UIView *subview in view.subviews)
    {
        if([subview isKindOfClass:[UILabel class]])
            [(UILabel *)subview setTextColor:[UIColor whateverColor]];
        else
            [self recolorLabelSubviews:subview];
        // this doesn't handle the case where you have a label as a subview of a label
        // if for some reason you're doing that, just move the [self recolorEtc:] call out of the "else" block
    }
}

// then, wherever you want to recolor every label in the scroll view...

[self recolorLabelSubviews:theScrollView];

Assuming they’re all subviews (first-level children) of the scroll view, not of container views inside it...

for(UIView *subview in theScrollView.subviews)
    if([subview isKindOfClass:[UILabel class]])
        [(UILabel *)subview setTextColor:[UIColor whateverColor]];

If the labels are inside other views inside the scroll view, you’ll have to recurse into each of the subviews and do the same thing, but that’s a pretty simple step from the above. Example:

- (void)recolorLabelSubviews:(UIView *)view
{
    for(UIView *subview in view.subviews)
    {
        if([subview isKindOfClass:[UILabel class]])
            [(UILabel *)subview setTextColor:[UIColor whateverColor]];
        else
            [self recolorLabelSubviews:subview];
        // this doesn't handle the case where you have a label as a subview of a label
        // if for some reason you're doing that, just move the [self recolorEtc:] call out of the "else" block
    }
}

// then, wherever you want to recolor every label in the scroll view...

[self recolorLabelSubviews:theScrollView];

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書生途 2024-12-09 05:27:54

尝试

for (UILabel *lbl in [self.view subviews]) {
    if([lbl isKindOfClass:[UILabel class]])
    {
        lbl.backgroundColor=[UIColor yellowColor];
    }
}

try

for (UILabel *lbl in [self.view subviews]) {
    if([lbl isKindOfClass:[UILabel class]])
    {
        lbl.backgroundColor=[UIColor yellowColor];
    }
}

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