Enumerate NSDictionary with keys and objects, PHP style

问题

I know you can Enumerate the keys or values of NSMutableDictionary using NSEnumerator. Is it possible to do both together? I'm looking for something similar to the PHP foreach enumerator like:

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

回答1:

Perhaps look into NSDictionary's method:

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

If you're not familiar with blocks in C/Objective-C, this is a good tutorial: http://thirdcog.eu/pwcblocks/

回答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]);
}

Outputs:

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

回答3:

Now much easier:

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

来源：https://stackoverflow.com/questions/3775507/enumerate-nsdictionary-with-keys-and-objects-php-style