UIViewController擴展

Question

我試圖用一些自定義方法擴展標準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 

如何現在可以使用擴展UIViewController？我需要從擴展UIViewController繼承我的自定義視圖控制器。

Answer 1

創建一個包含文件 「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 

然後，創建一個文件，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 

在說你的「SampleViewController .H「：

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

@interface SampleViewController : UIViewController 
@end 

然後在 」SampleViewController.m「：

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

享受！