objective-c - 排序数组和对象

Question

怎样才能对数组中的这些值进行倒序排列呢？

_gradientArrayToWhite = [[NSArray alloc] initWithObjects:@"1", @"2", @"3", @"4", @"5", @"6", @"7", @"8", @"9", @"10", nil];

Answer 1

使用NSArray的排序方法之一

NSArray * sorted = [_gradientArrayToWhite sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
    return [obj1 integerValue] < [obj2 integerValue];
}];

Answer 2

NSArray *arr = [NSArray arrayWithObjects:[NSNumber numberWithInt:1],[NSNumber numberWithInt:2],[NSNumber numberWithInt:3],[NSNumber numberWithInt:4],[NSNumber numberWithInt:5],[NSNumber numberWithInt:6],[NSNumber numberWithInt:7],[NSNumber numberWithInt:8],[NSNumber numberWithInt:9],[NSNumber numberWithInt:10], nil];

在这里你也可以像这样直接使用你的数组

NSArray *arr1 = [[NSArray alloc] initWithObjects:@"1", @"2", @"3", @"4", @"5", @"6", @"7", @"8", @"9", @"10", nil];


NSArray *revArr = [[arr reverseObjectEnumerator] allObjects];

Result = <__NSArrayM 0x71348e0>(
 10,
 9,
 8,
 7,
 6,
 5,
 4,
 3,
 2,
 1
)