NSMutableArray的XCode中

Question

我工作的一個iPhone應用程序，我已經定義的類像這樣：

@interface PlotData : NSObject { 
    NSString *sProbeID; 
    NSMutableArray *dataPoints; 

} 
@property (nonatomic, retain) NSString *sProbeID; 
@property (nonatomic, retain) NSMutableArray *dataPoints; 

@end 

@implementation PlotData 

@synthesize sProbeID; 
@synthesize dataPoints; 



- (void)dealloc { 
    [sProbeID release]; 
    [dataPoints release]; 

    [super dealloc]; 
} 

@end 

我主要的代碼，我需要創建這個類的一個NSMutableArray的。我已經在主代碼中定義了NSMutableArray（稱爲AllTheProbes），然後此代碼嘗試查找sProbeID，如果找不到它，它會向數組中添加一個新的PlotData類。

-(void) AddDataPointDictionary:(NSDictionary *)aDict WithProbe:(ProbeObj *)aProbe{ 

    NSLog(@"In AddDataPointDictionary."); 

    //The first step is to find the probe. 
    int nProbeLoc = -1; 
    PlotData *aPlotDataObj; 

    for (int i=0; i < [self.AllTheProbes count]; i++) { 
     aPlotDataObj = [self.AllTheProbes objectAtIndex:i]; 
     if (aPlotDataObj.sProbeID == aProbe.sID) { 
      nProbeLoc = i; 
     } 
    } 
    if (nProbeLoc == -1) { 
     NSLog(@" Did not find the record for %@.", aProbe.sID); 
     //We need to add this probe to the array of all probes. 
     PlotData *newPlot = [[PlotData alloc]init]; 
     newPlot.sProbeID = aProbe.sID; 
     NSMutableArray *newArr = [[NSMutableArray alloc]initWithCapacity:0]; 
     newPlot.dataPoints = newArr; 
     [self.AllTheProbes addObject:newPlot]; 
     [newPlot release]; 
     [newArr release]; 

     //set aPlotDataObj equal to the object we just added. 
     for (int i=0; i < [self.AllTheProbes count]; i++) { 
      aPlotDataObj = [self.AllTheProbes objectAtIndex:i]; 
      if (aPlotDataObj.sProbeID == aProbe.sID) { 
       nProbeLoc = i; 
      } 
     } 
     NSLog(@" Found the added record at %d.", nProbeLoc); 
     aPlotDataObj = [self.AllTheProbes objectAtIndex:nProbeLoc]; 

    } 
    else{ 
     NSLog(@" Found %@.", aPlotDataObj.sProbeID); 
     //Use the record we found 
     aPlotDataObj = [self.AllTheProbes objectAtIndex:nProbeLoc]; 
    } 

    //Add the dictionary to the plot array 
    [aPlotDataObj.dataPoints addObject:aDict]; 
    NSLog(@" Point added."); 
} 

我遇到的問題是數據看起來並不存儲。當找不到探頭時，在將新PlotData添加到AllTheProbes數組後，程序仍然找不到記錄。這是NSLogs的輸出。

2011-05-21 09:53:24.600 Stoker Monitor[4545:207] In AddDataPointDictionary. 
2011-05-21 09:53:24.601 Stoker Monitor[4545:207] Did not find the record for 7200001259348330. 
2011-05-21 09:53:24.601 Stoker Monitor[4545:207] Found the added record at -1. 
2011-05-21 09:53:24.602 Stoker Monitor[4545:207] Point added. 

請注意，第3條輸出行表示它在-1處找到了添加的記錄，這意味着它在添加後沒有找到它。

誰能告訴我我做錯了什麼？

感謝， NCGrimbo

Answer 1

你有頁頭，inited數組？

像這樣：

NSMutableArray *AllTheProbes = [[NSMutableArray alloc] init]; 

爲什麼你打self.AllTheProbes？不應該只是「AllTheProbes」？

希望有所幫助。