ios - 创建类似于 Extension Swift 的 UIViewController Category (Obj-C)

Question

我正在尝试使用一些自定义方法扩展标准 UIViewController。

#import <UIKit/UIKit.h>

@interface UIViewController (UIViewControllerExtension)
- (void) showNoHandlerAlertWithTitle:(NSString *)title andMessage:     (NSString*)message;
- (void) showAlertWithTitle:(NSString *)title andMessage:(NSString*)message  buttonTitles:(NSArray<NSString *>*)titles andHandler:(void (^)(UIAlertAction * action))handler;
@end

现在如何使用扩展的 UIViewController？我需要从扩展的 UIViewController 继承我的自定义 View Controller 。

Answer 1

创建一个文件“UIViewController+Alert.h”包含:

#import <UIKit/UIKit.h>
@interface UIViewController (AlertExtension)
- (void) showNoHandlerAlertWithTitle:(NSString *)title andMessage:     (NSString*)message;
- (void) showAlertWithTitle:(NSString *)title andMessage:(NSString*)message  buttonTitles:(NSArray<NSString *>*)titles andHandler:(void (^)(UIAlertAction * action))handler;
@end

然后，创建一个文件“UIViewController+Alert.m”，其中包含:

#import "UIViewController+Alert.h"
@implementation UIViewController (AlertExtension)
- (void) showNoHandlerAlertWithTitle:(NSString *)title andMessage:     (NSString*)message {
    // Insert code here
}

- (void) showAlertWithTitle:(NSString *)title andMessage:(NSString*)message  buttonTitles:(NSArray<NSString *>*)titles andHandler:(void (^)(UIAlertAction * action))handler {
    // Insert code here
}
@end

说你的“SampleViewController.h”:

#import <UIKit/UIKit.h>

@interface SampleViewController : UIViewController
@end

然后在“SampleViewController.m”中:

#import "SampleViewController.h"
#import "UIViewController+Alert.h"

@implementation SampleViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    [self showNoHandlerAlertWithTitle:@"Hello" andMessage:@"World"];
}
@end