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oc中字典的应用详解
NSDictionary *dic=[NSDictionary dictionaryWithObject:@"卢灿小样" forKey:@"lucan"]; NSLog(@"%@",dic); NSLog(@"%@",[dic objectForKey:@"lucan"]); //输出dic键值对个数 NSLog(@"%d",dic.count); NSDictionary *dic1=[NSDictionary dictionaryWithObject:@"卢灿实验2号" forKey:@"小样"]; NSLog(@"%@",[dic1 objectForKey:@"小样"]); NSDictionary *dic2=@{@"first":@"2301",@"sec":@"2034"}; NSDictionary *dic3=[NSDictionary dictionaryWithObjectsAndKeys:@"刘湘",@"name",@"小样",@"name1", nil]; NSLog(@" ----%@%@",dic2,dic3); //数组把vaule和key放到一个可变数组 NSArray *values=@[@123,@668,@345]; NSArray *key=@[@"first",@"swcond",@"third"]; NSDictionary *dic4=[NSDictionary dictionaryWithObject:values forKey:key]; NSLog(@"xxxxxxxxxxxx%@",dic4); //排序 NSArray *arry=[dic4 keysSortedByValueUsingSelector:@selector(compare:)]; NSLog(@"+++++++%@",arry); //用一个现有字典对象初始化另一个新字典对象(创建可变对象) NSDictionary *arry1=[[NSDictionary alloc]initWithDictionary:dic4 ]; NSLog(@"ooooooo%@",arry1); //保存对象到内容文件 NSString *path=@"/Users/apple/Desktop/test.plist"; [dic2 writeToFile:path atomically:YES]; //从以前保存的文件读取到字典对象 NSDictionary *data=http://www.mamicode.com/[NSDictionary dictionaryWithContentsOfFile:path]; NSLog(@"xxxxx%@",data); //字典的遍历key1相当于a[i]中的i,dic4就自己定义的字典 for (id key1 in dic4) { id vaule=[dic4 objectForKey:key1]; NSLog(@"qqqqqq%@%@",key,vaule); } //- (void)removeObjectForKey:(id)aKey; //删除键值对 NSMutableDictionary *dic7=[NSMutableDictionary dictionaryWithDictionary:dic2]; [dic7 removeObjectForKey:@"sec"]; NSLog(@"%@",dic7); // 判断key值有就替换没有就添加 [dic7 setObject:@"3412" forKey:@"sec"]; NSLog(@"%@",dic7); //增加dic4 字典无顺序 [dic7 addEntriesFromDictionary:dic4]; NSLog(@"%@",dic7);
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