iOS-sortedArrayUsingComparator使用

sortedArrayUsingComparator方法的几种使用范例、在真实项目中根据具体情况使用

1.降序

// 降序
    NSArray *tMlist = @[@1,@5,@2,@6,@3,@7,@9];
    NSArray *tArray = [tMlist sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
                           NSNumber *tNumber1 = (NSNumber *)obj1;
                           NSNumber *tNumber2 = (NSNumber *)obj2;
                           // 因为不满足sortedArrayUsingComparator方法的默认排序顺序，则需要交换
                           if ([tNumber1 integerValue] < [tNumber2 integerValue]) return NSOrderedDescending;
                           return NSOrderedAscending;
                       }];
    NSLog(@"降序%@",tArray.description);

2.升序

NSArray *tMlist = @[@1,@5,@2,@6,@3,@7,@9];
    NSArray *tArray = [tMlist sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
                           NSNumber *tNumber1 = (NSNumber *)obj1;
                           NSNumber *tNumber2 = (NSNumber *)obj2;
                           // 因为满足sortedArrayUsingComparator方法的默认排序顺序，则不需要交换
                           if ([tNumber1 integerValue] < [tNumber2 integerValue]) return NSOrderedAscending;
                           return NSOrderedDescending;
                       }];
    NSLog(@"升序%@",tArray.description);

3.数组逆转

NSArray *tMlist = @[@1,@5,@2,@6,@3,@7,@9];
    NSArray *tArray = [tMlist sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2){
                           // 数组逆转
                           return NSOrderedDescending;
                       }];
    NSLog(@"数组逆转%@",tArray.description);

4.数组不变

NSArray *tMlist = @[@1,@5,@2,@6,@3,@7,@9];
    NSArray *tArray = [tMlist sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2){
                           // 数组不变
                           return NSOrderedAscending;
                       }];
    NSLog(@"数组不变%@",tArray.description);