Xcode - viewDidLoad 方法不起作用

Question

我是 Objective-c 和 Xcode 的新手，但我相信我对它有足够的了解，意识到这里出了问题。我有一个使用故事板的应用程序，并且应用程序中的视图之一没有运行其 viewDidLoad 方法。我不确定这是否相关，但我最近不小心删除了原来的故事板，不得不制作另一个故事板。原来的运行得很好，没有任何问题，但当我使用新的时，它不起作用。有问题的视图也是选项卡栏控制器的第一个视图，这可能是问题的一部分。

以下是负责视图 (.h) 的类的代码：

#import <UIKit/UIKit.h>
@interface TabSynth : UIViewController
@property (nonatomic, retain) IBOutlet UIImageView *tomeWater;
@property (nonatomic, retain) IBOutlet UIImageView *tomeFire;
@property (nonatomic, retain) IBOutlet UIImageView *tomeAir;
@property (nonatomic, retain) IBOutlet UIImageView *tomeEarth;
@property (nonatomic, retain) IBOutlet UIImageView *tomeDark;
@property (nonatomic, retain) IBOutlet UIImageView *tomeLight;
@property (nonatomic, retain) IBOutlet UIButton *airSynthButton;
@property (nonatomic, retain) IBOutlet UIButton *darkSynthButton;
@property (nonatomic, retain) IBOutlet UIButton *earthSynthButton;
@property (nonatomic, retain) IBOutlet UIButton *fireSynthButton;
@property (nonatomic, retain) IBOutlet UIButton *lightSynthButton;
@property (nonatomic, retain) IBOutlet UIButton *waterSynthButton;
@property (nonatomic, retain) IBOutlet UIButton *synthButtonLarv;
@property (nonatomic, retain) IBOutlet UIButton *synthButtonAmoeb;
@property (nonatomic, retain) IBOutlet UIButton *synthButtonLarv1;
@property (nonatomic, retain) IBOutlet UIButton *synthButtonAmoeb1;
@property (nonatomic, retain) IBOutlet UIImageView *tomeWater1;
@property (nonatomic, retain) IBOutlet UIImageView *tomeFire1;
@property (nonatomic, retain) IBOutlet UIImageView *tomeAir1;
@property (nonatomic, retain) IBOutlet UIImageView *tomeEarth1;
@property (nonatomic, retain) IBOutlet UIImageView *tomeDark1;
@property (nonatomic, retain) IBOutlet UIImageView *tomeLight1;

以下是 (.m) 的代码：

#import "TabSynth.h"

@implementation TabSynth

@synthesize tomeWater;
@synthesize tomeFire;
@synthesize tomeAir;
@synthesize tomeEarth;
@synthesize tomeDark;
@synthesize tomeLight;
@synthesize tomeWater1;
@synthesize tomeFire1;
@synthesize tomeAir1;
@synthesize tomeEarth1;
@synthesize tomeDark1;
@synthesize tomeLight1;
@synthesize airSynthButton;
@synthesize darkSynthButton;
@synthesize earthSynthButton;
@synthesize fireSynthButton;
@synthesize lightSynthButton;
@synthesize waterSynthButton;
@synthesize synthButtonLarv;
@synthesize synthButtonAmoeb;
@synthesize synthButtonLarv1;
@synthesize synthButtonAmoeb1;

-(void)viewDidLoad {
    extern int gTomeAir;
    extern int gTomeDark;
    extern int gTomeEarth;
    extern int gTomeFire;
    extern int gTomeLight;
    extern int gTomeWater;
    extern int gAmoebaeNum;
    extern int gLarvaeNum;
    synthButtonAmoeb.hidden=YES;
    synthButtonAmoeb1.hidden=NO;
    synthButtonLarv.hidden=YES;
    synthButtonLarv1.hidden=NO;
    if (gTomeAir>0) {
        tomeAir.hidden=NO;
        tomeAir1.hidden=YES;
        airSynthButton.hidden=NO;
    }
    if (gTomeDark>0) {
        tomeDark.hidden=NO;
        tomeDark1.hidden=YES;
        darkSynthButton.hidden=NO;
    }
    if (gTomeEarth>0) {
        tomeEarth.hidden=NO;
        tomeEarth1.hidden=YES;
        earthSynthButton.hidden=NO;
    }
    if (gTomeFire>0) {
        tomeFire.hidden=NO;
        tomeFire1.hidden=YES;
        fireSynthButton.hidden=NO;
    }
    if (gTomeLight>0) {
        tomeLight.hidden=NO;
        tomeLight1.hidden=YES;
        lightSynthButton.hidden=NO;
    }
    if (gTomeWater>0) {
        tomeWater.hidden=NO;
        tomeWater1.hidden=YES;
        waterSynthButton.hidden=NO;
    }
    if (gAmoebaeNum > 0) {
        synthButtonAmoeb.hidden=NO;
        synthButtonAmoeb1.hidden=YES;
    }
    else {
        synthButtonAmoeb.hidden=YES;
        synthButtonAmoeb1.hidden=NO;
    }
    if (gLarvaeNum >= 1) {
        synthButtonLarv.hidden=NO;
        synthButtonLarv1.hidden=YES;
    }
    else {
        synthButtonLarv.hidden=YES;
        synthButtonLarv1.hidden=NO;
    }
}

在 if 语句中，被调用的外部整数 (gTome) 被设置为等于前面的数字看法。任何帮助都会很棒，我为我的编码的简单性表示歉意。

Answer 1

如果它没有调用 viewDidLoad，那么首先要检查的是在故事板中您是否已将 TabSynth 正确设置为视图控制器的自定义类。另外，我在您的 viewDidLoad 方法中没有看到 NSLog 。你怎么知道它没有被调用？

顺便问一下，您是否知道可以将非 UI 对象放入 nib 或 Storyboard 中？我认为这可能会帮助您简化代码。例如，您可以定义一个 ElementViews 类，如下所示：

ElementViews.h

@interface ElementViews : NSObject

@property (assign, nonatomic) IBOutlet UIImageView *tome;
@property (assign, nonatomic) IBOutlet UIButton *synthButton;
@property (assign, nonatomic) IBOutlet UIImageView *tome1;

@end

，然后在您的 TabSynth 类中，不再为每个元素使用三个出口，而是只有一个出口：

TabSynth.h

@class ElementViews;

@interface TabSynth : UIViewController

@property (nonatomic, retain) IBOutlet ElementViews *waterViews;
@property (nonatomic, retain) IBOutlet ElementViews *fireViews;
@property (nonatomic, retain) IBOutlet ElementViews *airViews;
@property (nonatomic, retain) IBOutlet ElementViews *earthViews;
@property (nonatomic, retain) IBOutlet ElementViews *darkViews;
@property (nonatomic, retain) IBOutlet ElementViews *lightViews;

@property (nonatomic, retain) IBOutlet UIButton *synthButtonLarv;
@property (nonatomic, retain) IBOutlet UIButton *synthButtonAmoeb;
@property (nonatomic, retain) IBOutlet UIButton *synthButtonLarv1;
@property (nonatomic, retain) IBOutlet UIButton *synthButtonAmoeb1;
...

在故事板中，将通用“对象”（看起来像橙色立方体）拖到您的 TabSynth 场景中。将其自定义类更改为 ElementViews，并将其标识标签更改为 Water Views。将 TabSynth 的 waterViews 出口连接到这个新的 ElementViews 对象，并将 ElementViews 对象的出口连接到三个水视图（tome 和 tome1 图像视图以及 synthButton 按钮）。对其他五个元素重复此操作。

然后你可以像这样简化你的 viewDidLoad 方法：

- (void)configureElementViews:(ElementViews *)elementViews state:(int)state {
    if (state > 0) {
        elementViews.tome.hidden = NO;
        elementViews.tome1.hidden = YES;
        elementViews.synthButton.hidden = NO;
    }
}

- (void)viewDidLoad {
    extern int gTomeAir;
    extern int gTomeDark;
    extern int gTomeEarth;
    extern int gTomeFire;
    extern int gTomeLight;
    extern int gTomeWater;
    extern int gAmoebaeNum;
    extern int gLarvaeNum;

    synthButtonAmoeb.hidden=YES;
    synthButtonAmoeb1.hidden=NO;
    synthButtonLarv.hidden=YES;
    synthButtonLarv1.hidden=NO;

    [self configureElementViews:self.waterViews state:gTomeWater];
    [self configureElementViews:self.fireViews state:gTomeFire];
    [self configureElementViews:self.airViews state:gTomeAir];
    [self configureElementViews:self.earthViews state:gTomeEarth];
    [self configureElementViews:self.darkViews state:gTomeDark];
    [self configureElementViews:self.lightViews state:gTomeLight];
}

Answer 2

好的，但是你必须在方法 -viewDidLoad 的开头编写 [super viewDidLoad] 来调用 Controller 的 viewDidLoad code> 本身（对象层次结构中的父亲或其前身），然后再编写创建 -viewDidLoad 的派生版本的出色代码。

瞧，祝你好运。