在iOS7中更改“取消”按鈕BackgroundColor和UISearchBar的文本

Question

我有以下代碼可以更改UISearchBar中“取消”按鈕的背景。

for( UIView *subview in self.searchBar.subviews ){
    if ([subview isKindOfClass:[UIButton class]]) {
        [(UIButton *)subview setEnabled:YES];
        [(UIButton *)subview setTitle:@"New Button Text" forState:UIControlStateNormal];
        ((UIButton *)subview).tintColor = [UIColor colorWithRed:4/255.0 green:119/255.0 blue:152/255.0 alpha:1.0];
    }
}

問題是此代碼在iOS7中不起作用！ UISearchBar中的視圖結構發生了什么變化？

編輯：在這里測試，這是UISearchBar的新層次結構：

UISearchBar:
---UIView:
------UISearchBarBackground
------UISearchBarTextField
------UINavigationButton

問題是我無法測試if ([sub isKindOfClass:[UINavigationButton class]]) 。 此行引發編譯錯誤： Use of undeclared identifier: UINavigationButton

Answer 1

[Edited]

試試這個代碼。

如果要更改所有取消按鈕，請添加AppDelegate 。

[[UIBarButtonItem appearanceWhenContainedIn:[UISearchBar class], nil] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                                                                      [UIColor redColor],
                                                                                                      UITextAttributeTextColor,
                                                                                                      [UIColor whiteColor],
                                                                                                      UITextAttributeTextShadowColor,
                                                                                                      [NSValue valueWithUIOffset:UIOffsetMake(0, 0)],
                                                                                                      UITextAttributeTextShadowOffset,
                                                                                                      nil]
                                                                                            forState:UIControlStateNormal];

在iOS7中，我們需要添加objectAtIndex:0 and subviews.

iOS7中的searchBar子視圖層次結構已更改，請嘗試以下操作：

in iOS7:

NSArray *searchBarSubViews = [[self.searchBar.subviews objectAtIndex:0] subviews];


iOS6 and before:

NSArray *searchBarSubViews =  self.searchBar.subviews;

Answer 2

解決方案：我創建了自己的按鈕。 這樣，我可以管理所有屬性，而不必了解Apple對元素所做的工作

我只需要創建一個UIView aux即可包含searchBar和新Button。

self.searchBar.showsCancelButton = NO; //don`t show the original cancelButton

self.cancelSearchButton = [UIButton buttonWithType:UIButtonTypeCustom];
self.cancelSearchButton.frame = CGRectMake(250, 6, 60, 31);
[self.cancelSearchButton setTitle:@"Cancelar" forState:UIControlStateNormal];
[self.cancelSearchButton addTarget:self action:@selector(searchBarCancelButtonClicked) forControlEvents:UIControlEventTouchUpInside];
NSString *fontName = [[self.cancelSearchButton titleLabel] font].fontName;
[[self.cancelSearchButton titleLabel] setFont:[UIFont fontWithName:fontName size:11.0]];
UIView *aux = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
aux.backgroundColor = [UIColor colorWithRed:230/255.0 green:230/255.0 blue:230/255.0 alpha:1.0];
aux.layer.borderWidth = 1.0f;
aux.layer.borderColor = [UIColor lightGrayColor].CGColor;
aux.layer.cornerRadius = 0.0f;
[aux addSubview:self.searchBar];
[aux addSubview:self.cancelSearchButton];

- (void)searchBarCancelButtonClicked{
    //do whatever I want to do here
}

Answer 3

您可以利用iOS運行時屬性_cancelButton來實現此目的。

UIButton *cancelButton = [self.searchBar valueForKey:@"_cancelButton"];
[cancelButton setTitleColor:[UIColor yourColor] forState:UIControlStateNormal];

用於更改文字

[self.searchBar setValue:@"customString" forKey:@"_cancelButtonText"];