視圖控制器和UIView之間的簡單委託不工作

Question

所以我使用一個簡單的委託從一個主視圖控制器訪問一個函數，當在主視圖之上生成一個疊加層的子視圖上按下一個按鈕時。由於某些原因，在源視圖控制器中定義的函數未被執行。我做了這100次，感覺我只是想念一些愚蠢的東西。這裏是代碼如何不起作用？

源ViewController's.h：

#import <UIKit/UIKit.h> 
#import "ProfileSettingsViewController.h" 
#import "ImageViewer.h" 

@interface ProfileViewController : UIViewController <UITextFieldDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate, subViewDelegate> 

源viewController.m：

#import <Parse/Parse.h> 
#import <QuartzCore/QuartzCore.h> 
#import "ImageViewer.h" 
#import "ProfileViewController.h" 

@interface ProfileViewController() <UITextFieldDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate, subViewDelegate> 

@end 

//where the ImageViewer object is defined  
@implementation ProfileViewController 
{ 
    NSMutableArray *dataArray; 
    ImageViewer *loadImageViewer; 
} 

//where the UIView is initialized 
- (void) handleImageTap:(UIGestureRecognizer *)gestureRecognizer 
{ 
    if ([gestureRecognizer view] == _profilePic) 
    { 
     loadImageViewer = [ImageViewer alloc]; 
     [loadImageViewer loadImageIntoViewer:self imageToLoad:_profilePic.image]; 
    } 
    else if ([gestureRecognizer view] == _coverPhoto) 
    { 

    } 
} 

目的地View's.h

#import <UIKit/UIKit.h> 
#import <QuartzCore/QuartzCore.h> 

@protocol subViewDelegate 
-(void)photoFromSubview:(id)sender; 
@end 

@interface ImageViewer : UIView 

@property (nonatomic, assign) id <subViewDelegate> delegate; 
@property (nonatomic, copy) UIImage *mainImage; 
@property (nonatomic, copy) UIViewController *parentView; 

- (void)fromCameraRoll; 
- (void)takePhoto; 
- (void)removeImageViewer; 
- (void)captureImage:(id)sender; 
- (void)uploadPhoto:(id)sender; 
- (UIImage *)addBackground; 
- (ImageViewer *)loadImageIntoViewer:(UIViewController *)superView imageToLoad:(UIImage *)imageToLoad; 

@end 

目的地View's.m

#import "ImageViewer.h" 

@implementation ImageViewer : UIView 

//synthesize properties 
@synthesize mainImage = _mainImage; 
@synthesize parentView = _parentView; 

//initialize the image viewer 
- (ImageViewer *)loadImageIntoViewer:(UIViewController *)superView imageToLoad:(UIImage *)imageToLoad 
{ 
    //create a new view with the same frame size as the superView 
    ImageViewer *imageViewer = [[ImageViewer alloc] initWithFrame:superView.view.bounds]; 
    _mainImage = imageToLoad; 
    _parentView = superView; 

    //if something's gone wrong, abort! 
    if(!imageViewer) 
    { 
     return nil; 
    } 

    //add all components and functionalities to the program 
    UIImageView *background = [[UIImageView alloc] initWithImage:[imageViewer addBackground]]; 
    background.alpha = 0.85; 
    [imageViewer addSubview:background]; 
    [imageViewer addSubview:[imageViewer addImageToView:_mainImage superView:superView.view]]; 
    [imageViewer addSubview:[imageViewer addButtonToView:(superView.view.bounds.origin.x + 10.0) yPos:(superView.view.bounds.origin.x + 10.0) buttonAction:@selector(back:) buttonTitle:@"Back"]]; 
    [imageViewer addSubview:[imageViewer addButtonToView:(superView.view.bounds.origin.x + 10.0) yPos:((superView.view.center.y/2) + 270.0) buttonAction:@selector(captureImage:) buttonTitle:@"Camera"]]; 
    [imageViewer addSubview:[imageViewer addButtonToView:(superView.view.bounds.origin.x + 105.0) yPos:((superView.view.center.y/2) + 270.0) buttonAction:@selector(uploadPhoto:) buttonTitle:@"Upload"]]; 
    [imageViewer addSubview:[imageViewer addButtonToView:(superView.view.bounds.origin.x + 200.0) yPos:((superView.view.center.y/2) + 270.0) buttonAction:@selector(rotatePhoto:) buttonTitle:@"Rotate"]]; 
    [superView.view addSubview:imageViewer]; 

    return imageViewer; 
} 

//call delegate method 
- (void)captureImage:(id)sender 
{ 
    [self.delegate photoFromSubview:self]; 
} 

我搞砸了不是嗎？

Answer 1

調試這個最好的方法是使用斷點，看看被調用什麼，什麼不是（並檢查你的委託是否正確設置）。在我頭頂，我會說你或者忘記了那個代表團，或者如果你在使用IB，可能是一個出口。

編輯：好吧，現在看來，你的委託屬性是在錯誤的類。該屬性應該在你的子視圖，並創建從上海華盈是子視圖的時候，你應該正確設置委託，這樣的事情：

mySubview.delegate = self; 

Answer 2

它看起來就像在你ProfileViewController.h你缺少圖像瀏覽器的聲明

@property (nonatomic, weak) ImageViewer *imageViewer; 

而在你的ProfileViewController.m中，你需要設置委託。

self.imageViewer.delegate = self; 

Answer 3

您需要將目標代理設置爲self。

ImageViewer *imageViewer = [[ImageViewer alloc] initWithFrame:superView.view.bounds]; 
imageViewer.delegate = self; 

Answer 4

當你有一個UIView在你初始化對象並調用load方法後加載它自己，你可以使用設置委託。

imageViewer.delegate = superView; 

凡ImageView的是新初始化的視圖不與對象自混淆（self.delegate =上海華是不一樣），並且其中的SuperView是是創建了UIView的父視圖。

現在我的最後一個問題是有沒有更好的方法來做我所做的事情？我覺得我已經過了複雜的情況。

Answer 5

我在完全相同的情況下有完全相同的問題。 做了一些腦力激盪後，我發現問題併成功解決。

問題是UIView對象的範圍。因此，要解決此問題，請在.h文件中創建全局對象並將其用作目標對象。

@interface profilePageViewController : parentViewController<PhotoUploadViewDelegate,UIImagePickerControllerDelegate,UINavigationControllerDelegate,ConnectionsDelegate> 
{ 
    PhotoUploadView *photoUploadView; 

，它會工作非常肯定，你也可以嘗試通過打印對象，你會發現在委託調用init和其他兩個不同的時間objects.One。