委托分配导致EXC_BAD_ACCESS [英] Delegate assignment causes EXC_BAD_ACCESS

问题描述

我试图在我的视图控制器中为NSTextField创建一个委托，但是该程序因EXC_BAD_ACCESS而崩溃.为什么会这样?我读到我正在调用不存在的对象，但是我不知道什么不存在.我正在使用ARC.

I am trying to create a delegate for an NSTextField in my view controller, but the program crashes with EXC_BAD_ACCESS. Why does this happen? I read that I am calling a non-existent object, but I don´t know what does not exist. I am using ARC.

这是在我的视图控制器中创建委托对象的方式:

This is how the delegate object is created in my view controller:

#import <Cocoa/Cocoa.h>
#import "Delegate.h"

@interface ViewController : NSViewController <NSTextFieldDelegate>{
}
@end

-

#import "ViewController.h"
@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    NSTextField* textField1 = [[NSTextField alloc] initWithFrame:NSMakeRect(200, 200, 150, 20)];
    [self.view addSubview:textField1];

    Delegate* delegate1 = [[Delegate alloc]init];
    [textField1 setDelegate:delegate1];
}

@end

为什么我的程序崩溃?

推荐答案

我认为delegate1已发布，在viewDidLoad

Delegate* delegate1 = [[Delegate alloc]init];

您应该在ViewController.h中创建一个用于处理它的变量.然后

You should create a var for handling it in ViewController.h. Then

delegate1 = [[Delegate alloc]init];

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