#import <Foundation/Foundation.h>
// 字典：NSDictionary和NSMutableDictionary
int main(int argc, const char * argv[]) {
@autoreleasepool {
// 只读字典
NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys:@"第一个元素的Value", @"value1",@"第二个元素的Value", @"value2", @"第三个元素的value", @"value3",nil];
//遍历字符串
for(NSString *key in dictionary)
{
NSLog(@"%@:%@", key, [dictionary objectForKey:key]);
NSLog(@"%@:%@", key, dictionary[key]);
}
// 可读写的字典
NSMutableDictionary *mutableDictionary = [NSMutableDictionary dictionary];
mutableDictionary[@"key1"] = @"first value";
mutableDictionary[@"key2"] = @"second value";
mutableDictionary[@"key3"] = @"third value";
NSLog(@"key2 = %@", mutableDictionary[@"key2"]);
[mutableDictionary removeObjectForKey:@"key3"];
for(NSString *key in mutableDictionary)
{
NSLog(@"%@:%@", key, [mutableDictionary objectForKey:key]);//打印的时候与实例化的顺序无关
}
}
return 0;
}
12-11 字典（NSDictionary和NSMutableDictionary.png
