摘要：
NSSortDescriptor *sortDescriptor; sortDescriptor =[[NSSortDescriptor alloc] initWithKey:@"length" ascending:YES]; NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor]; NSMutableArray *Arr = [NSMutableArray arrayWithObjects:@"水电费",@"爱迪adad",@"a", 阅读全文
