Objective-C 字典、可变字典

#import <UIKit/UIKit.h>
#import "AppDelegate.h"

int main(int argc, char * argv[]) {
// 从@符号创建字典  实际上就是键值对容器
NSDictionary *dict = @{@"name":@"zhangsan",@"sex":@"male"};
NSLog(@"%@",dict);

// 根据键获取值
NSLog(@"%@",[dict objectForKey:@"name"]);

// 从配置文件中读取
NSDictionary *dict1 = [NSDictionary dictionaryWithContentsOfFile:
[[NSBundle mainBundle] pathForResource:@"data" ofType:@"plist" ]];
NSLog(@"%@",[dict1 objectForKey:@"name"]);
NSLog(@"%@",[dict1 objectForKey:@"age"]);

@autoreleasepool {
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
}
}

NSMutableDictionary *dict2 = [[NSMutableDictionary alloc]init];
// setObject 可以新增key 也可以修改已有key的值
[dict2 setObject:@"jinpangpang" forKey:@"name"];
[dict2 setObject:@"113" forKey:@"name"];
NSLog(@"%@",[dict2 objectForKey:@"name"]);