使用PHP样式的键和对象枚举NSDictionary

Question

我知道你可以列举的键或值NSMutableDictionary使用NSEnumerator.有可能一起做两件事吗？我正在寻找类似于PHP foreach枚举器的东西,如:

foreach ($dictionary as $key => $value);

Answer 1

也许看看NSDictionary的方法:

enumerateKeysAndObjectsUsingBlock:(void (^)(id key, id obj, BOOL *stop))

如果您不熟悉C/Objective-C中的块,这是一个很好的教程:http://thirdcog.eu/pwcblocks/

Answer 2

NSDictionary* d = [NSDictionary dictionaryWithObjectsAndKeys:@"obj1",@"key1",
                                                           @"obj2",@"key2",
                                                           @"obj3",@"key3",
                                                           @"obj4",@"key4",nil];

for (id key in [d allKeys]) {
    NSLog(@"%@ - %@",key,[d objectForKey:key]);
}

输出:

keytest[7880:a0f] key3 - obj3
keytest[7880:a0f] key1 - obj1
keytest[7880:a0f] key4 - obj4
keytest[7880:a0f] key2 - obj2

Answer 3

现在更容易:

for (NSString * key in dict)
{
    id/* or your type */ value = dict[key];
    ...
}