IBOutlet 在自定义 UIView 中为零(使用 STORYBOARD) [英] IBOutlet is nil inside custom UIView (Using STORYBOARD)

问题描述

我有一个自定义的 UIView 类.在其中，我为 UIImageView 声明了一个 IBOutlet 属性.

I have a custom UIView class. Inside it I have declared an IBOutlet property for UIImageView.

#import <UIKit/UIKit.h>

@interface SettingItem : UIView{

}

@property (strong, nonatomic) IBOutlet UIImageView *myImage;

@end

现在我正在使用故事板.有一个视图控制器.我将 UIView 拖到 viewcontroller.我拖了一个 UIImageView 作为上面 UIView 的子视图.我从情节提要中将SettingItem"类设置为 UIView.我通过从实用程序窗口的 SettingItem 出口正常拖动将出口连接到 myImage.

Now i am using storyboard. There is a viewcontroller. I dragged UIView to viewcontroller. I dragged one UIImageView as a subview of above UIView. I set the "SettingItem" class to UIView from storyboard. I connected the outlet to myImage by normal dragging from outlets of SettingItem from utilities window.

#import "SettingItem.h"

@implementation SettingItem

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        [self baseInit];
    }
    return self;
}

-(id) initWithCoder:(NSCoder *)aDecoder{
    self = [super initWithCoder:aDecoder];
    if (self) {
        // Initialization code
        [self baseInit];
    }
    return self;
}

- (void) baseInit{
    NSLog(@"myImage %@"self.myImage);
}

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
}
*/

@end

现在我的问题是 myImage 总是 nil，上面 NSLog 只是打印 (null) 为插座.我检查了情节提要中的视图并检查了它的出口引用及其指向 myImage.我错过了一些东西.我用谷歌搜索帮助但找不到任何解决方案.

Now my problem is myImage is always nil, above NSLog just print (null) for the outlet. I checked the view in storyboard and checked its outlet reference and its pointing to myImage. I am missing something. I googled for the help but couldn't find any solution.

你能指出我做错了什么吗?

Can you please point out what am i doing wrong ?

推荐答案

在您的视图中覆盖awakeFromNib - 这是分配 IBOutlets 后要调用的第一个生命周期方法，并且是您代码的正确位置.

Override awakeFromNib in your view - this is the first lifecycle method to be called after the IBOutlets have been assigned and is the right place for your code.

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