在UISearchBar中更改取消按钮的框架

Question

我有以下代码来更改我的应用程序中UISearchBar的外观，它也可以在下面的图像中看到：

for(int i = 0; i < [[searchBar subviews] count]; i++){
    UIView *subView = [[searchBar subviews] objectAtIndex:i];
    if([[NSString stringWithFormat:@"%@", [subView class]] isEqualToString:@"UINavigationButton"]){
        UIButton *cancelButton = (UIButton *)subView;

        CGRect buttonFrame = cancelButton.frame;
        buttonFrame.size.height = 52;
        [cancelButton setFrame:buttonFrame];

        [cancelButton setTitle:@"Cancel" forState:UIControlStateNormal];
        [cancelButton setBackgroundImage:[UIImage imageNamed:@"cancel.png"] forState:UIControlStateNormal];
        [cancelButton setBackgroundImage:[UIImage imageNamed:@"cancel_pressed.png"] forState:UIControlStateHighlighted];
    }
}

正如您所看到的，我正在尝试更改UISearchBar中包含的按钮的高度而没有运气。我确实参考了按钮，因为我可以更改文本和背景图像更改而不是框架的高度。我只想按钮的高度与52px的搜索框相同。

修改

我找到了一个非常hacky的解决方案，但是添加UIButton作为Cancel Button的子视图并不是很优雅。它做的工作，但正如我说它不是很好。

Answer 1

实际上你可以使用下面的方法来访问取消按钮：

UIBarButtonItem *cancelButton = [UIBarButtonItem appearanceWhenContainedIn:[UISearchBar class], nil];

Answer 2

所以我用这个覆盖-layoutSubViews，但是我有2个问题

我讨厌在视图中迭代以找到匹配的视图，它会稍微搞乱动画

- (UIButton *)cancelButton {
    for (UIView *v in self.subviews) {
        if ([v isKindOfClass:[UIButton class]]) {
            NSString *caption = [[((UIButton *)v) titleLabel] text];
            if ([caption isEqualToString:@"Cancel"] )
                return (UIButton *)v;
        }
    }
    return nil;
}

- (BOOL)cancelButtonIsShowing {
    return ([self cancelButton] != nil);
}

- (void)layoutSubviews {
    [super layoutSubviews];
    if ([self cancelButtonIsShowing]) {
        UIButton *cancelButton = [self cancelButton];

        UIImage *i = [UIImage imageNamed:@"Cancel_BTN"];
        CGRect f = CGRectMake(267, 5, i.size.width, i.size.height);
        cancelButton.frame = f;
    }
}