如何使用UISearchBar去除自定义UINavigationItem左侧的空间

Question

在我的导航栏中，我有一个放大镜图标，会显示一个搜索栏。我没有使用UISearchDisplayController，因此我选择构建自己的UINavigationItem，然后使用pushNavigationItem将其推送到标准UINavigationItem。

问题是UINavigationItem似乎被推到右边8个像素左右。这会导致取消按钮（带有本地化文本'Annuleren'）非常接近屏幕边缘。

我尝试在运行时检查self.mySearchBar.bounds，但原点是0,0。我玩过AutoLayout并以编程方式添加了约束，但我没有成功。我希望没有AutoLayout就可以。

这是我的代码：

- (IBAction)displaySearchBar:(id)sender {
if (!self.mySearchNavigationItem)
{
    self.mySearchNavigationItem = [[UINavigationItem alloc] initWithTitle:@""];
    self.mySearchNavigationItem.hidesBackButton = YES;
    self.mySearchBar = [[UISearchBar alloc] initWithFrame:CGRectZero];
    self.mySearchBar.showsCancelButton = YES;
    self.mySearchBar.delegate = self;
    [self.mySearchBar sizeToFit];
    [self.mySearchBar setPlaceholder:@"Zoeken..."];

    UIView *barWrapper = [[UIView alloc]initWithFrame:self.mySearchBar.bounds];
    [barWrapper addSubview:self.mySearchBar];
    self.mySearchNavigationItem.leftBarButtonItem = nil;
    self.mySearchNavigationItem.backBarButtonItem = nil;

    self.mySearchNavigationItem.titleView = barWrapper;
    UIButton *cancelButton;
    UIView *topView = self.mySearchBar.subviews[0];
    for (UIView *subView in topView.subviews) {
        if ([subView isKindOfClass:NSClassFromString(@"UINavigationButton")]) {
            cancelButton = (UIButton*)subView;
        }
    }
    if (cancelButton) {
        [cancelButton setTitle:@"Annuleren" forState:UIControlStateNormal];
    }            
}
[self.navigationController.navigationBar pushNavigationItem:self.mySearchNavigationItem animated:YES];

NSTimeInterval delay;
if (self.tableView.contentOffset.y >1000) delay = 0.4;
else delay = 0.1;
[self performSelector:@selector(activateSearch) withObject:nil afterDelay:delay];        

}

Answer 1

尝试：

self.navigationController.navigationBar.barTintColor = self.mySearchBar.barTintColor;

如果不起作用，您可以在导航控制器中添加底色视图，这是您想要的颜色。这可能很有用：Get the right color in iOS7 translucent navigation bar

Answer 2

经过几个小时的搜索，我放弃了，然后进行了肮脏的修复。我会暂时打开它，以防有人知道为什么我的搜索栏向右移动了8个像素。

在显示UINavigationItem之前，我将整个UINavigationBar移动到x坐标-8。

self.navigationController.navigationBar.frame = CGRectMake(-8.0, self.navigationController.navigationBar.frame.origin.y, self.navigationController.navigationBar.frame.size.width, self.navigationController.navigationBar.frame.size.height);
[self.navigationController.navigationBar pushNavigationItem:self.mySearchNavigationItem animated:YES];

然后在取消按钮上单击，我将其移回x坐标0。

- (IBAction)cancelSearchBar:(id)sender {
    [self.navigationController.navigationBar popNavigationItemAnimated:YES];    
    self.navigationController.navigationBar.frame = CGRectMake(0.0, self.navigationController.navigationBar.frame.origin.y, self.navigationController.navigationBar.frame.size.width, self.navigationController.navigationBar.frame.size.height);
}