Iphone 字符串标识要更新的iVar

我有一系列的5个IVAR。（highscore01、highscore02、highScore03、highScore04、highScore05）我想用整数值更新特定的iVar。IVAR被定义为INT。IVAR在一个叫做HighScores的班级里

要更新的特定iVar是其中存储的当前值最低的iVar。我想用新值替换最低值

我有一个方法，它用最小的值标识ivar，并返回一个字符串“theString”，其中包含要更新的ivar的名称

我的问题是：如何使用“字符串”更新正确的iVar

下面是一个代码示例

// If any of the highScore iVars contain 0, then they are still empty.
// Find the first empty iVar and store score there.

 if (scoreVarsFullFlag == NO) // Flag to indicate if any iVars are still zero
 {
 if (theHighScores.highScore01 == 0)
  theHighScores.highScore01 = mainScores.scoreTotal;
 else if (theHighScores.highScore02 == 0)  
  theHighScores.highScore02 = mainScores.scoreTotal;
 else if (theHighScores.highScore03 == 0)
  theHighScores.highScore03 = mainScores.scoreTotal;
 else if (theHighScores.highScore04 == 0)
  theHighScores.highScore04 = mainScores.scoreTotal;
 else if (theHighScores.highScore05 == 0)
  {
   theHighScores.highScore05 = mainScores.scoreTotal;
   scoreVarsFullFlag = YES; // Last scores iVar turns nonzero - set Flag to YES, to indicate no non-zero iVars
  }
 }
 else
 {

  NSLog(@"The Lowest is at %@", [theHighScores findLowestHighScore]);
  NSString * theString;
  theString = [NSString stringWithString:[theHighScores findLowestHighScore]];
  NSLog(@"The String is: %@", theString);
            theHighScores.theString = mainScores.scoreTotal; // This fails
}

最后一行是我尝试将“字符串”中标识的iVar设置为新分数。“字符串”确实包含要更新的iVar的名称，即“HighScore03”等

如果我是手动设置的，它将是； HighScores.HighScores03=主要得分.ScoresTotal

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如果我是你的话，我会使用可变数组来进行排序并轻松挑选出最低的项目

///store this in your app delegate
NSMutableArray *highscores = [[NSMutableArray alloc] init];



//then when you want to add a high score
[highscores addObject:[NSNumber numberWithDouble:mainScores.scoreTotal]];

NSSortDescriptor *myDescriptor;
myDescriptor = [[NSSortDescriptor alloc] initWithKey:@"doubleValue" ascending:NO];
[highscores sortUsingDescriptors:[NSArray arrayWithObject:myDescriptor]];

///remove the last object if it's over 5
if ([highscores count]>5) {
    [highscores removeLastObject];
}

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我认为mjdth的解决方案可能是最好的，但是您也可以使用-setValue:forKey:，尽管您必须切换到使用NSNumbers，而不是ints

[theHighScores setValue: [NSNumber numberWithInt: mainScores.scoreTotal] forKey: [theHighScores findLowestHighScore]];

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听起来你在做一些基本的练习。具体来说，使用

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谢谢你的帮助。设置可变数组肯定是更好的方法。

int newValue = 1;
SEL methodName = NSSelectorFromString(@"setHighScore03:");
[theHighScores performSelector:methodName withObject:newValue];