帮助 For 循环和 NSMutableDictionary

Question

我正在使用 for 循环（当前）NSLog NSArray 的内容。但是，我想将数组的内容设置为 NSMutableDictionary，具体取决于它的 objectAtIndex。目前数组中有 843 个对象，因此我宁愿不必一遍又一遍地输入相同的内容！

我目前的代码是这样的

NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
string = [string stringByReplacingOccurrencesOfString:@"\n" withString:@""];
NSArray *chunks = [string componentsSeparatedByString:@","];
for (int i = 0; i < [chunks count]; i ++) {
    NSLog(@"%@", [chunks objectAtIndex:i]);
}

我想按以下方式将数组的内容设置到 NSMutableDictionary 中，一旦 objectAtIndex 为 11，我想将字典中的第 12 个对象设置为键 @"type" 等等：

[dict setObject:[chunks objectAtIndex:0] forKey:@"type"];
[dict setObject:[chunks objectAtIndex:1] forKey:@"name"];
[dict setObject:[chunks objectAtIndex:2] forKey:@"street"];
[dict setObject:[chunks objectAtIndex:3] forKey:@"address1"];
[dict setObject:[chunks objectAtIndex:4] forKey:@"address2"];
[dict setObject:[chunks objectAtIndex:5] forKey:@"town"];
[dict setObject:[chunks objectAtIndex:6] forKey:@"county"];
[dict setObject:[chunks objectAtIndex:7] forKey:@"postcode"];
[dict setObject:[chunks objectAtIndex:8] forKey:@"number"];
[dict setObject:[chunks objectAtIndex:9] forKey:@"coffee club"];
[dict setObject:[chunks objectAtIndex:10] forKey:@"latitude"];
[dict setObject:[chunks objectAtIndex:11] forKey:@"longitude"];

Answer 1

我不确定我是否完全理解这个问题，但我认为您的 chunks 数组包含一长串数据，以相同的方式排序（即第 0、第 12、第 24、第 36 ......元素都是type，以及第 1、13、25、37... 元素都是name)。如果是这种情况，您可以使用以下内容：

NSArray *keys = [NSArray arrayWithObjects:@"type", @"name", @"street", @"address1", @"address2", @"town", @"county", @"postcode", @"number", @"coffee club", @"latitude", @"longitude", nil];

for (NSUInteger i = 0; i < [chunks count]; i += [keys count])
{
    NSArray *subarray = [chunks subarrayWithRange:NSMakeRange(i, [keys count])];
    NSDictionary *dict = [[NSDictionary alloc] initWithObjects:subarray forKeys:keys];
    
    // do something with dict

    [dict release];
}

请注意，NSDictionary 的同一个键不能有两个不同的值。也就是说，如果您为 type 键设置了两个不同的值，则只会保留最后一个设置的值。

编辑

如果您的数组不是 12 的倍数，因为例如它在末尾包含垃圾数据，您可以改用不同的循环样式：

// max should be a multiple of 12 (number of elements in keys array)
NSUInteger max = [chunks count] - ([chunks count] % [keys count]);
NSUInteger i = 0;

while (i < max)
{
    NSArray *subarray = [chunks subarrayWithRange:NSMakeRange(i, [keys count])];
    NSDictionary *dict = [[NSDictionary alloc] initWithObjects:subarray forKeys:keys];
    
    // do something with dict

    [dict release];
    
    i += [keys count];
}

Answer 2

由于您的按键没有模式，因此您最好像现在一样手动操作。

Answer 3

最直接的做法是使用您发布的代码。但如果你真的想使用循环，应该这样做。

NSArray *keys = [NSArray arrayWithObjects:@"type", @"name", @"street", @"address1", @"address2", @"town", @"county", @"postcode", @"number", @"coffee club", @"latitude", @"longitude", nil];
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
string = [string stringByReplacingOccurrencesOfString:@"\n" withString:@""];
NSArray *chunks = [string componentsSeparatedByString:@","];
for (int i = 0; i < [chunks count] && i < [keys count]; i ++) {
    [dict setObject:[chunks objectAtIndex:i] forKey:[keys objectAtIndex:i]];
}

Answer 4

NSArray* keys = [NSArray arrayWithObjects:@"type",@"name",@"street",@"address1",@"address2",@"town",@"county",@"postcode",@"number",@"coffee club",@"latitude",@"longitude",nil];

    for (int i = 0; i < [chunks count]; i ++){
        [dict setObject:[chucks objectAtIndex:i] forKey:[keys objectAtIndex:i]]; 
    }