NSMutableArray *commentListArray=[[NSMutableArray alloca]init];
// 為每個屬性創(chuàng)建NSSortDescriptor對象,并確定為升序
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"commentId" ascending:YES];//
// 設置排序優(yōu)先級，并組成數(shù)組暑中。這里優(yōu)先級最高為commentId
NSArray * sortDescriptors =? [[NSArray alloc] initWithObjects:&sortDescriptor count:1];
[commentListArray sortUsingDescriptors:sortDescriptors];
// 為數(shù)組中每個元素執(zhí)行方法壹瘟，輸出狀態(tài)
[commentListArray makeObjectsPerformSelector:@selector(printState)];
