PickerView加載數據的問題

我加載從服務器這是沒有任何問題做工精細的數據，我可以在NSLog作爲PickerView加載數據的問題

2013-11-19 16:22:48.799 Paaa[4278:a0b] res ({ "choice_name" = "DATA0"; }, { "choice_name" = "DATA1"; }, { "choice_name" = "DATA2"; })The problem is I can't view it in the `pickerView` It always indicate to `return [res count]` as EXC_BAD_ACCESS. So please where would be my problem?

.H看到res值：

@property (nonatomic, strong) NSMutableArray *res;

.M：

- (void)requestPos:(ASIFormDataRequest *)request{ 

    NSData *responseData = [request responseData]; 
NSString *jsonString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; 

// Create a dictionary from the JSON string 
NSDictionary *result = [jsonString JSONValue]; 
[jsonString release]; 

    CXMLDocument *doc = [[[CXMLDocument alloc] initWithXMLString:[result objectForKey:@"Response"] options:0 error:nil] autorelease]; 

NSArray *nodes = [doc nodesForXPath:@"/root" error:nil]; 

    NSArray *nodes3 = NULL; 
    nodes3 = [doc nodesForXPath:@"/root/cl_choicelist/cl_choice" error:nil]; 

    NSLog(@"node3%@", nodes3); 

    // we will put parsed data in an a array 
    res = [[NSMutableArray alloc] init]; 

for (CXMLElement *node in nodes3) { 
    NSMutableDictionary *item = [[NSMutableDictionary alloc] init]; 

    int counter; 
    for(counter = 0; counter < [node childCount]; counter++) { 
     // common procedure: dictionary with keys/values from XML node 
     [item setObject:[[node childAtIndex:counter] stringValue] forKey:[[node childAtIndex:counter] name]]; 
    } 

    // and here it is - attributeForName! Simple as that. 
    [item setObject:[[node attributeForName:@"choice_name"] stringValue] forKey:@"choice_name"]; // <------ this magical arrow is pointing to the area of interest. 

    [res addObject:item]; 
    [item release]; 
} 
    NSLog(@"res %@", res); 
    [res release]; 
} 

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{ 
return 1; 
} 

-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{ 
return [res count]; 
} 

-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{ 
return [[res objectAtIndex:row]objectForKey:@"choice_name"]; 
} 

- (IBAction)openPickerView{ 

[actionSheet showInView:self.view]; 

[UIView beginAnimations:nil context:nil]; 
[actionSheet setBounds:CGRectMake(0, 0, 320, 492)]; 
[UIView commitAnimations]; 
}

來源

2013-11-20 Luai Kalkatawi

評論這// [RES發佈]; –

@Bhumeshwerkatre我會嘗試。 –

首先你再次釋放你的res數組試着去訪問它。所以它會給出例外。消息發送到解除分配的實例。所以不要發佈「res」數組，因爲這將在未來使用。 –

不要在結束時發佈

如果Bhumeshwer katre不會寫自己的答案，那麼我會:)

來源

2013-11-20 12:10:46

爲什麼我不在'requestPos：'結尾釋放它？ –

1）因爲你應該使用ARC，2）因爲你想以後使用它，不是嗎？我認爲這就是Bhumeshwer所說的，你說過解決了你的問題。 –

好的。那麼我應該在哪裏發佈它？ –

PickerView加載數據的問題

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