Objective-C 字典小结

//创建字典的方法
NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:
@"wtq",@"name1",
@"wtm",@"name2",
@"wtp",@"name3",
nil];

//将字典的值输出来
NSLog(@"new dictionary is %@",[dic objectForKey:@"name2"]);

//如何遍历字典；使用枚举
NSEnumerator *e = [dic objectEnumerator];
id ee;
while (ee=[e nextObject]) {
NSLog(@" enumer %@",ee);
}

//获取字典中的所有值

NSArray *values = [dic
allValues];

NSLog(@"all:%@",values);

//保存字典到文件

NSString *filePath = [[[NSBundle
mainBundle]resourcePath]
stringByAppendingPathComponent:@"dict.text"];

BOOL success = [dic writeToFile:filePath
atomically:YES];

//相反，我们可以用一个文件的内容来填充一个字典

NSDictionary *myDict2 = [NSDictionary
dictionaryWithContentsOfFile:filePath];