将对象添加到NSMutableArray时遇到问题 [英] Having problems with adding objects to NSMutableArray

问题描述

我在将对象添加到NSMutableArray * array时遇到问题.

I am having problem with adding objects to NSMutableArray *array.

//  Controller.m
#import "Controller.h"
@implementation Controller
- (void)parser:(NSString *)string{
    [array addObject:string]; 
    NSLog(@"answerArray(1): %@",[array objectAtIndex:1]);
    [array retain];
}
@end

//  Controller.h
#import <Foundation/Foundation.h>
@interface Controller : NSObject {
    NSMutableArray *array;
}
- (void)parser:(NSString *)string;
@end

NSLog(@"answerArray(1):％@"，[array objectAtIndex:1]);

NSLog(@"answerArray(1): %@",[array objectAtIndex:1]);

结果:answerArray(1):(空)

Results: answerArray(1): (null)

推荐答案

首先，您要保留数组过多.

First off, you're over-retaining the array.

第二，您没有提供用于初始化数组的代码，因此我想它没有分配和初始化.这将导致代码向nil对象发送消息，并因此返回nil.

Second, you didn't provide the code for initializing the array, so I guess it's not allocated and initialized. This will cause the code to message a nil object and thus return nil.

您应该为Controller对象创建init方法，并分配一个新的NSMutableArray对象(并保留它).

You should create an init method for the Controller object, and allocate a new NSMutableArray object (and retain it).

还可以使用适当的dealloc来释放阵列.

Also, a proper dealloc to release the array.

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