ios - 如何在 iOS 中为自定义后退按钮创建可重用代码

我创建了一个自定义后退按钮(代码如下)。到目前为止，我一直在通过我的应用程序在每个页面上重新粘贴这段代码。我想知道是否有人可以以我的代码为例，并指导我如何将其放入一个集中位置，这样我就不必再复制和粘贴它了。

我猜这将进入我将创建的自定义类 .h 和 .m 中，但就代码本身在自定义文件中的样子而言，我不确定下一步该做什么。

// Create custom back button

UIButton *backButton      = [UIButton buttonWithType:UIButtonTypeCustom];
UIImage  *backButtonImage = [UIImage imageNamed"back.png"];

[backButton setBackgroundImage:backButtonImage
                      forState:UIControlStateNormal];

[backButton addTarget:self
               actionselector(backButton)
     forControlEvents:UIControlEventTouchUpInside];

[backButton setFrame:CGRectMake(0, 0, 40, 40)];
UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
[[self navigationItem] setLeftBarButtonItem:backButtonItem];

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Best Answer-推荐答案

我可能会使用 UIViewController 上的一个类别，其界面如下:

@interface UIViewController (MyBackButton)

- (void)installBackButtonWithActionSEL)action;

@end

实现是您问题中的代码，将 @selector(backButton) 替换为 action:

#import "UIViewController+MyBackButton.h"

@implementation UIViewController (MyBackButton)

- (void)installBackButtonWithActionSEL)action {
    UIButton *backButton      = [UIButton buttonWithType:UIButtonTypeCustom];
    UIImage  *backButtonImage = [UIImage imageNamed"back.png"];

    [backButton setBackgroundImage:backButtonImage
                          forState:UIControlStateNormal];

    [backButton addTarget:self
                   action:action
         forControlEvents:UIControlEventTouchUpInside];

    [backButton setFrame:CGRectMake(0, 0, 40, 40)];
    UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
    [[self navigationItem] setLeftBarButtonItem:backButtonItem];
}

@end

你可以这样调用它，例如:

- (void)viewDidLoad {
    [super viewDidLoad];
    [self installBackButtonWithActionselector(backButton)];
}

关于ios - 如何在 iOS 中为自定义后退按钮创建可重用代码，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17138223/