ios - 在开关 block 中使用 objectAtIndex 方法

Question

我的数组中有一个纬度和经度数组，

NSArray *anArrayOfFloatObjects = [NSArray arrayWithObjects:
                                  [NSNumber numberWithDouble:pinLocation1.latitude],
                                  [NSNumber numberWithDouble:pinLocation1.longitude],
                                  [NSNumber numberWithDouble:pinLocation2.latitude],
                                  [NSNumber numberWithDouble:pinLocation2.longitude],
                                  [NSNumber numberWithDouble:pinLocation3.latitude],
                                  [NSNumber numberWithDouble:pinLocation3.longitude],
                                  nil];

我想做的是使用 switch 语句遍历数组(即 objectAtIndex..)

   switch (self.anArrayOfFloatObjects objectAtIndex:) {
        case :0
        //switch the pin color to red
            break;
        case :2
        //switch pin color to green
            break;
        default:
            break;
    }

这显然行不通。有谁知道其他方法吗？

Answer 1

我相信你要找的是

[anArrayOfFloatObjects indexOfObject:number]

也许这段代码会有所帮助:

NSArray *anArrayOfFloatObjects; //Your array

for (NSNumber *number in anArrayOfFloatObjects) {

    switch ([anArrayOfFloatObjects indexOfObject:number]) {
        case :0
            //switch the pin color to red
            break;
        case :2
            //switch pin color to green
            break;
        default:
            break;
    }
}

编辑:

在@MikeS 评论之后你可以做这样的事情:

for (int index = 0; index < [anArrayOfFloatObjects count]; index++) {
    switch (index) {
        case :0
            //switch the pin color to red
            break;
        case :2
            //switch pin color to green
            break;
        default:
            break;
    }
}

避免调用[anArrayOfFloatObjects indexOfObject:number]