iOS - sortedArrayUsingComparator
2020-04-21 本文已影响0人
Simple_Code
sortedArrayUsingComparator
和compare
配合使用可以写出更优雅的代码
代码:
// 定义一个数组数组
NSArray *array = @[@(3),@(5),@(4),@(2),@(1),@1,@4];
// 对数组进行排序(升序)
NSArray *resultAscending = [array sortedArrayUsingComparator:^NSComparisonResult(NSNumber *obj1, NSNumber *obj2) {
NSLog(@"%@ ~ %@", obj1, obj2);
// 方法一:(推荐)
return [obj1 compare:obj2];
// 方法二:
NSComparisonResult result = [obj1 compare:obj2];
if (result == NSOrderedAscending) {
return NSOrderedAscending;// 3 5
} else if (result == NSOrderedDescending) {
return NSOrderedDescending;// 5 4
} else {
return NSOrderedSame;
}
// 方法三:
if (obj1.integerValue > obj2.integerValue) {
return NSOrderedDescending;// 5 4
} else if (obj1.integerValue < obj2.integerValue) {
return NSOrderedAscending;// 3 5
} else {
return NSOrderedSame;
}
}];
NSLog(@"对数组进行排序(正序):%@", resultAscending);
// 对数组进行排序(降序)
NSArray *resultDescending = [array sortedArrayUsingComparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
NSLog(@"%@ ~ %@", obj1, obj2);
return [obj2 compare:obj1];
}];
NSLog(@"对数组进行排序(降序):%@", resultDescending);
// 对数组进行排序(乱序)
NSArray *resultBreak = [resultAscending sortedArrayUsingComparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
NSLog(@"%@ ~ %@", obj1, obj2);
if (arc4random_uniform(2) == 0) { // arc4random_uniform会随机返回一个0到上界之间(不含上界)的整数。以2为上界会得到0或1,像投硬币一样
return [obj2 compare:obj1];// descending
} else {
return [obj1 compare:obj2];// ascending
}
}];
NSLog(@"对数组进行排序(乱序):%@", resultBreak);
// 对数组进行排序(倒序)
NSArray *resultReversal = [array sortedArrayUsingComparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
NSLog(@"%@ ~ %@", obj1, obj2);
return NSOrderedDescending;
}];
NSLog(@"对数组进行排序(倒序):%@", resultReversal);
打印结果:
2020-04-21 16:13:32.239073+0800 TT[7523:642448] 3 ~ 5
2020-04-21 16:13:32.239212+0800 TT[7523:642448] 5 ~ 4
2020-04-21 16:13:32.239316+0800 TT[7523:642448] 3 ~ 4
2020-04-21 16:13:32.239402+0800 TT[7523:642448] 2 ~ 1
2020-04-21 16:13:32.239532+0800 TT[7523:642448] 1 ~ 4
2020-04-21 16:13:32.239617+0800 TT[7523:642448] 1 ~ 1
2020-04-21 16:13:32.239732+0800 TT[7523:642448] 2 ~ 1
2020-04-21 16:13:32.239842+0800 TT[7523:642448] 2 ~ 4
2020-04-21 16:13:32.240251+0800 TT[7523:642448] 3 ~ 1
2020-04-21 16:13:32.240555+0800 TT[7523:642448] 3 ~ 1
2020-04-21 16:13:32.240817+0800 TT[7523:642448] 3 ~ 2
2020-04-21 16:13:32.241128+0800 TT[7523:642448] 3 ~ 4
2020-04-21 16:13:32.241415+0800 TT[7523:642448] 4 ~ 4
2020-04-21 16:13:32.241758+0800 TT[7523:642448] 5 ~ 4
2020-04-21 16:13:32.242164+0800 TT[7523:642448] 对数组进行排序(正序):(
1,
1,
2,
3,
4,
4,
5
)
2020-04-21 16:13:32.242530+0800 TT[7523:642448] 3 ~ 5
2020-04-21 16:13:32.242896+0800 TT[7523:642448] 3 ~ 4
2020-04-21 16:13:32.243326+0800 TT[7523:642448] 5 ~ 4
2020-04-21 16:13:32.243801+0800 TT[7523:642448] 2 ~ 1
2020-04-21 16:13:32.245034+0800 TT[7523:642448] 1 ~ 4
2020-04-21 16:13:32.245157+0800 TT[7523:642448] 2 ~ 4
2020-04-21 16:13:32.245255+0800 TT[7523:642448] 2 ~ 1
2020-04-21 16:13:32.245587+0800 TT[7523:642448] 1 ~ 1
2020-04-21 16:13:32.245928+0800 TT[7523:642448] 5 ~ 4
2020-04-21 16:13:32.246260+0800 TT[7523:642448] 4 ~ 4
2020-04-21 16:13:32.246611+0800 TT[7523:642448] 3 ~ 4
2020-04-21 16:13:32.246962+0800 TT[7523:642448] 3 ~ 2
2020-04-21 16:13:32.247345+0800 TT[7523:642448] 对数组进行排序(降序):(
5,
4,
4,
3,
2,
1,
1
)
2020-04-21 16:13:32.247798+0800 TT[7523:642448] 1 ~ 1
2020-04-21 16:13:32.248112+0800 TT[7523:642448] 1 ~ 2
2020-04-21 16:13:32.248542+0800 TT[7523:642448] 3 ~ 4
2020-04-21 16:13:32.249035+0800 TT[7523:642448] 4 ~ 5
2020-04-21 16:13:32.249276+0800 TT[7523:642448] 3 ~ 5
2020-04-21 16:13:32.249614+0800 TT[7523:642448] 4 ~ 5
2020-04-21 16:13:32.249983+0800 TT[7523:642448] 4 ~ 4
2020-04-21 16:13:32.250339+0800 TT[7523:642448] 1 ~ 3
2020-04-21 16:13:32.250672+0800 TT[7523:642448] 1 ~ 3
2020-04-21 16:13:32.251180+0800 TT[7523:642448] 2 ~ 3
2020-04-21 16:13:32.251723+0800 TT[7523:642448] 2 ~ 5
2020-04-21 16:13:32.252757+0800 TT[7523:642448] 对数组进行排序(乱序):(
1,
1,
3,
2,
5,
4,
4
)
2020-04-21 16:13:32.252884+0800 TT[7523:642448] 3 ~ 5
2020-04-21 16:13:32.253037+0800 TT[7523:642448] 3 ~ 4
2020-04-21 16:13:32.253498+0800 TT[7523:642448] 5 ~ 4
2020-04-21 16:13:32.253734+0800 TT[7523:642448] 2 ~ 1
2020-04-21 16:13:32.254113+0800 TT[7523:642448] 1 ~ 4
2020-04-21 16:13:32.254624+0800 TT[7523:642448] 1 ~ 4
2020-04-21 16:13:32.254758+0800 TT[7523:642448] 1 ~ 1
2020-04-21 16:13:32.255501+0800 TT[7523:642448] 4 ~ 4
2020-04-21 16:13:32.255678+0800 TT[7523:642448] 4 ~ 1
2020-04-21 16:13:32.256158+0800 TT[7523:642448] 4 ~ 1
2020-04-21 16:13:32.256340+0800 TT[7523:642448] 4 ~ 2
2020-04-21 16:13:32.256795+0800 TT[7523:642448] 对数组进行排序(倒序):(
4,
1,
1,
2,
4,
5,
3
)