从NSString中创建变量名 [英] Make variable name out of NSString
问题描述
我有一个for循环,其中9六边形(hexagon1到hexagon9)必须创建...但我不能使用hexString作为Sprite的名称,因为它是一个NSString,对吧?那么我该怎么做呢?
I have got a for loop where 9 hexagons (hexagon1 through hexagon9) have to be created... But I cannot use hexString as the name of the Sprite because it is a NSString, right ? So how would I make it right ?
hexString [< - 我想让for循环生成hexagon1,然后hexagon2等等,而不是NSString] = [self createHexagon:ccp(xVal,yVal):i];
int hexCount = [[[itemPositions valueForKey:myString]valueForKey:@"hexposition"] count];
for (int i=1;i<=hexCount;i++){
NSString *hexString = [NSString stringWithFormat:@"hexagon%d",i];
NSNumber *generatedXVal = [[[[itemPositions valueForKey: myString ]valueForKey:@"hexposition"] valueForKey: hexString]valueForKey: @"xVal"];
int xVal = [generatedXVal integerValue];
NSNumber *generatedYVal = [[[[itemPositions valueForKey: myString ]valueForKey:@"hexposition"] valueForKey: hexString ]valueForKey: @"yVal"];
int yVal = [generatedYVal integerValue];
hexString = [self createHexagon:ccp(xVal,yVal) : i];
NSLog(@"%@", hexString);
}
推荐答案
使用 NSMutableDictionary
。
for (int i=1;i<=hexCount;i++){
NSString *hexString = [NSString stringWithFormat:@"hexagon%d",i];
CCSprite *sprite = [self doSomethingToGetSprite];
[mutableDictionary setObject:sprite forKey:hexString];
}
稍后你可以使用以下代码遍历字典中的所有精灵:
Later you can iterate over all the sprites in the dictionary using:
for (NSString *key in mutableDictionary) {
CCSprite *sprite = [mutableDictionary objectForKey:key];
[self doStuffWithSprite:sprite];
}
顺便说一下,为什么要覆盖 hexString
你在这里指定:
By the way, why are you overwriting hexString
that you assign here:
NSString *hexString = [NSString stringWithFormat:@"hexagon%d",i];
使用这里的一个:
hexString = [self createHexagon:ccp(xVal,yVal) : i];
该方法调用是一个明显的语法错误,悬挂:i
部分。
And that method call is an obvious syntax error with the dangling : i
part there.
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