从沙盒获取指定类型指定名字的文件路径

NNString *path = [[NSBundle mainBundle]parthResource:@"sortednames" ofTppe:@"plist"];

根据字典中的所有键值

self.allkeys = [self.name.allkeys sortedArraUsingSelector:@selecctor(compare)];NSLog(@"allkeys :%@",self.allkeys);

NSRange三中创建方式

NSRange range;range.location = 7;range.length = 5;

NSRange range2 = {6,5};

cocoa提供的函数NSRange range3 = NSMakeRange(6,5);