iOS的顯示圖像點擊

Question

這就是我要做的：

在點擊「信息（I）」按鈕，我需要顯示有一個酥料餅左邊的圖像和右邊的一些相關文字。

現在，讓我們在後臺將視圖稱爲「視圖1」，將彈出視圖視爲「視圖2」。

這裏是View2Controller.h的樣子：

@class View2Controller; 
@protocol View2ControllerDelegate <NSObject> 

- (void)infoPopover:(View2Controller *)obic loadImage: (NSString *)imageFilename; 

@end 

@interface View2Controller : UIViewController 
@property (strong, nonatomic) IBOutlet UIImageView *imageInfo; 
@property (strong, nonatomic) IBOutlet UILabel *textInfo; 

@property (nonatomic, assign) id<View2ControllerDelegate> delegate; 

@end 

id <View2ControllerDelegate> _delegate; 

現在View1Controller.h有這樣一行：

@interface View1Controller : UIViewController <View2ControllerDelegate> 

而且View1Controller.m的@implementation頗像這

- (IBAction)showInfo:(id)sender { 
UIButton *btn = (UIButton *)sender; 

View2Controller *obic = [[View2Controller alloc]init]; 
[obic setDelegate:self]; 

switch (btn.tag) { 
    case 1: 
     [self infoPopover:obic loadImage:@"info1.png"]; 
     break; 

    case 2: 
     //Info View 2 
     break; 

    case 3: 
     //Info View 3 
     break; 

    case 4: 
     //Info View 4 
     break; 

    case 5: 
     //Info View 5 
     break; 

    case 6: 
     //Info View 6 
     break; 


    default: 
     break; 
} 
} 

and

- (void)infoPopover:(View2Controller *)obic loadImage:(NSString *)imageFilename 
{ 
    [obic.imageInfo setImage:[UIImage imageNamed:imageFilename]]; 
} 

我查閱了幾個關於代表如何工作的教程。但是我仍然無法在'UIImageView imageinfo'上顯示圖像'info1.png'。任何意見都非常感謝！

Answer 1

解決！

正如之前Paulw11所建議的，代表並不是首先要走的路。所以我拿出了委託代碼。我還拿出了IBAction的showinfo。相反，我所用的方法：

-(BOOL)shouldPerformSegueWithIdentifier:(NSString *)identifier sender:(id)sender 
{ 
    if ([identifier isEqualToString:@"info"]) { 
     UIButton *btn = (UIButton *)sender; 
    [[NSUserDefaults standardUserDefaults]setInteger:btn.tag forKey:@"infoButton"]; 
} 
return YES; 

在View1Controller並在View2Controller我說：

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    NSArray *imageArray = @[@"info1.png", @"info2.png", @"info3.png", @"info4.png", @"info5.png", @"info6.png"]; 
    int infoButtonChoice = [[NSUserDefaults standardUserDefaults] integerForKey:@"infoButton"]; 

    [self.imageInfo setImage:[UIImage imageNamed:imageArray[infoButtonChoice -1]]]; 
} 

這使得應用程序的工作正是我想要！

Answer 2

如果你有一個連接到你的信息按鈕的流行歌曲，那麼你不需要創建一個View2Controller - segue會爲你做到這一點。

可以擺脫showInfo IBAction爲方法，並添加prepareForSegue:方法 -

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
{ 
    View2Controller *obic=(View2Controller)segue.destinationViewController; 
    obic.delegate=self; 

    UIButton *btn = (UIButton *)sender; 


    NSString *imageFilename=nil; 

    switch (btn.tag) { 
    case 1: 
     imageFilename=@"info1.png"; 
     break; 

    case 2: 
     //Info View 2 
     break; 

    case 3: 
     //Info View 3 
     break; 

    case 4: 
     //Info View 4 
     break; 

    case 5: 
     //Info View 5 
     break; 

    case 6: 
     //Info View 6 
     break; 


    default: 
     break; 
    } 

    if (image!=nil) 
    { 
     [obic.imageInfo setImage:[UIImage imageNamed:imageFilename]]; 
    } 
    else 
    { 
     NSLog(@"Unknown button tag triggered segue - %d",btn.tag); 
    } 
} 

也沒什麼，你在這裏顯示需要View1Controller充當View2Controller代表，所以也許你誤解是什麼代表團用於。假設View2Controller中有一個按鈕，當它被按下時你想通知View1Controller - 在View2Controller中，你可以調用[self.delegate theButtonWasPressed];，這將在任何代理中調用該方法（可以是實現View2ControllerDelegate協議的View1Controller實例）