Objective--C的Foundation frame之NSMutableDictionary代码

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{
    @autoreleasepool
    {
        /*
         字典：
         存储的内存不是连续的
         用key和value进行对应（键值）
         kvc 键值编码
         */
        NSDictionary *dict1 = [NSDictionary dictionaryWithObject:@"1" forKey:@"a"];
        NSLog(@"dict1 = %@", dict1);
        
        NSDictionary *dict2 = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:@"1", @"2", @"3", nil] forKeys:[NSArray arrayWithObjects:@"a", @"b", @"c", nil]];
        NSLog(@"dict2 = %@", dict2);
        
        NSDictionary *dict3 = @{@"1":@"a", @"2":@"b"};//1, 2 代表key，a, b 代表value
        NSLog(@"dict3 = %@", dict3);
        int count = (int)[dict2 count];
        NSLog(@"count = %d", count);
        
        NSString *value1 = [dict2 valueForKey:@"b"];
        NSLog(@"value1 = %@", value1);
        
        NSString *value2 = [dict2 objectForKey:@"b"];
        NSLog(@"value2 = %@", value2);
        
        NSArray *allValues = [dict2 allValues];
        NSLog(@"allValues = %@", allValues);
        NSArray *allKey = [dict2 allKeys];
        NSLog(@"allKey = %@", allKey);
        
        NSArray *array = [dict2 objectsForKeys:[NSArray arrayWithObjects:@"a", @"b", @"d", nil] notFoundMarker:@"not fount"];
        NSLog(@"array = %@", array);
        
        //遍历字典
        for(NSString *key in dict2)
        {
            NSLog(@"%@ = %@", key, [dict2 objectForKey:key]);
        }
        for(id object in dict2)
        {
            NSLog(@"%@ = %@", object, [dict2 objectForKey:object]);
        }
        //用枚举器遍历
        NSEnumerator *en = [dict2 keyEnumerator];
        id key = nil;
        while (key = [en nextObject])
        {
            NSLog(@"key - %@", key);
        }
#pragma mark - NSMutableDictionary
        NSMutableDictionary *dictM = [[NSMutableDictionary alloc] init];
        //添加键值对
        [dictM setValue:@"1" forKey:@"a"];
        [dictM setValue:@"2" forKey:@"b"];
        NSLog(@"dictM = %@", dictM);
        //删除键值对
//        [dictM removeAllObjects];
//        [dictM removeObjectForKey:@"b"];
        [dictM removeObjectsForKeys:[NSArray arrayWithObjects:@"a", @"b", nil]];
        NSLog(@"dictM = %@", dictM);
        
    }
    return 0;
}