UIViewController扩展

Question

我试图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 

如何现在可以使用扩展UIViewController？我需要从扩展UIViewController继承我的自定义视图控制器。

Answer 1

创建一个包含文件 “的UIViewController + Alert.h”：

#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，其中包含 “的UIViewController + Alert.m”：

#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 

在说你的“SampleViewController .H“：

#import <UIKit/UIKit.h> 
#import "UIViewController+Alert.h" 

@interface SampleViewController : UIViewController 
@end 

然后在 ”SampleViewController.m“：

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

享受！