在iOS 11上，搜索文本字段在搜索栏中的位置错误 [英] Wrong placement of search text field inside search bar on iOS 11

问题描述

我使用iOS 11中引入的新API将UISearchController用作导航栏的一部分，并在ViewController的viewDidLoad中以以下方式使用它

 -(void)viewDidLoad {[super viewDidLoad];[_table setDataSource:self];[_table setDelegate:self];searchController = [[UISearchController alloc] initWithSearchResultsController:nil];[self.navigationItem setSearchController:searchController];[self.navigationItem setHidesSearchBarWhenScrolling:NO];[searchController.searchBar setBackgroundColor:[UIColor greenColor]];} 

但是，搜索文本字段显示在搜索栏内的错误位置.请看下面的屏幕截图.

之后:

在(void)viewDidLoad中的

Obj-C:使用此代码:

 如果(@available(iOS 11，*)){UITextField * textField = [self.searchController.searchBar valueForKey:@"searchField"];UIView * backgroundView = textField.subviews.firstObject;backgroundView.backgroundColor = UIColor.whiteColor;backgroundView.layer.cornerRadius = 10;backgroundView.clipsToBounds = YES;} 

在viewDidLoad()中

Swift:使用此代码:

 如果#available(iOS 11.0，*){如果让textfield = scb.value(forKey:"searchField")为?UITextField {textfield.textColor = UIColor.blue如果让backgroundview = textfield.subviews.first {backgroundview.backgroundColor = UIColor.whitebackgroundview.layer.cornerRadius = 10;backgroundview.clipsToBounds = true;}}} 

I am using UISearchController as part of navigation bar using the new APIs introduced in iOS 11. I am using it in the following manner in my ViewController's viewDidLoad

- (void)viewDidLoad {  
    [super viewDidLoad];  
    [_table setDataSource:self];  
    [_table setDelegate:self];  
    searchController = [[UISearchController alloc] initWithSearchResultsController:nil];  
    [self.navigationItem setSearchController:searchController];  
    [self.navigationItem setHidesSearchBarWhenScrolling:NO];  
    [searchController.searchBar setBackgroundColor:[UIColor greenColor]];  
} 

However, the search text field is rendered at the wrong position inside the search bar. Look at the following screenshot.

https://imgur.com/a/Igf49

I inspected the view hierarchy and found that UISearchBarTextField object (which is not accessible directly to devs) in the search bar has a frame.y value of 1 which is probably causing this issue. I have tested this on iOS 11 beta 10 and iOS 11 GM.

Is this a known issue? Is there any fix for this? Or is it something I am doing wrong on my end?

Any help will be appreciated (:

解决方案

Here's code which shows how to change the background colour of textField in searchBar on iOS 11.

Before:

After:

Obj-C: in (void)viewDidLoad use this code:

 if (@available(iOS 11, *)) {
    UITextField *textField = [self.searchController.searchBar valueForKey:@"searchField"];
    UIView *backgroundView = textField.subviews.firstObject;
    backgroundView.backgroundColor = UIColor.whiteColor;
    backgroundView.layer.cornerRadius = 10;
    backgroundView.clipsToBounds = YES;
}

Swift: in viewDidLoad() use this code:

if #available(iOS 11.0, *) {
    if let textfield = scb.value(forKey: "searchField") as? UITextField {
        textfield.textColor = UIColor.blue

        if let backgroundview = textfield.subviews.first {
            backgroundview.backgroundColor = UIColor.white
            backgroundview.layer.cornerRadius = 10;
            backgroundview.clipsToBounds = true;
        }
    }
}

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