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这是我的代码：

for (int i=0; i<countingArray.count; i++) {
    NSDictionary *element=[countingArray objectAtIndex:i];
    NSString *source=[element objectForKey:@"id"];
    NSInteger count= [[element objectForKey:@"count"] integerValue];
    NSLog("source: %@",source); //Works
    NSLog("count %d",count);    //Don't Work! Error at this line

    for(int c=0; c<subscriptions.count; c++) {
        SubscriptionArray * element =[subscriptions objectAtIndex:c];
        NSLog(@"sorgente sub %@",element.source);
        NSLog(@"sorgente counting %@",source);
        if([source isEqualToString:element.source]) {
            element.count=count;
            [subscriptions replaceObjectAtIndex:c withObject:element];
            NSLog(@"equal"); 
            //this part of code is never been executed but I'm sure that
            //the if condition in some cases returns true
        }
    }
}

当我尝试在NSLog("count %d",count);没有任何信息的情况下让我的应用程序崩溃时。我还有另一个问题，if([source isEqualToString:element.source])我确定有时条件返回真......如何删除空格？像 php 中的 trim 函数？谢谢

4

2 回答 2

1

我没有注意到前两个 NSLog 语句。他们都是形式NSLog("something: %@", something)。这是一个 C 字符串文字，而 NSLog 采用 NSString 作为其格式。这将导致崩溃。你想要NSLog(@"source: %@", source)。

于 2011-09-02T23:29:14.467 回答
1

改变：

NSString *source=[element objectForKey:@"id"];
NSInteger count= [[element objectForKey:@"count"] integerValue];

到：

 NSString *source=[element valueForKey:@"id"];
 NSInteger count= [[element valueForKey:@"count"] integerValue];

要删除空格，您可以尝试：

NSString *trimmedString = [yourString stringByReplacingOccurrencesOfString:@" " withString:@""];
于 2011-09-02T23:34:08.373 回答