去掉數(shù)組中的重復(fù)元素：

NSArray *arr = @[@"12-11", @"12-11", @"12-11", @"12-12", @"12-13", @"12-14"];

NSSet *set = [NSSet setWithArray:arr];

NSLog(@"set%@\n", set);

打印出來(lái)的結(jié)果：

{(

"12-11",

"12-14",

"12-13",

"12-12"

)}

對(duì)結(jié)果進(jìn)行有序排列：

NSArray *sortDesc = @[[[NSSortDescriptor alloc] initWithKey:nil ascending:YES]];

NSArray *sortSetArray = [set sortedArrayUsingDescriptors:sortDesc];

NSLog(@"set%@\nsort set%@", set, sortSetArray);

打印出來(lái)結(jié)果：

sort set(

"12-11",

"12-12",

"12-13",

"12-14"

)

想起來(lái)一直用NSArray的排序代碼

NSArray *arr = @[@"12-11", @"12-11", @"12-11", @"12-12", @"12-13", @"12-14"];

NSArray *sort2Array = [arr sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {

return [obj1 localizedCompare:obj2];

}];

NSLog(@"sort2 array %@", sort2Array);

//本地化比較

- (NSComparisonResult)localizedCompare:(NSString *)string;

//本地化比較(不區(qū)分大小寫(xiě))

- (NSComparisonResult)localizedCaseInsensitiveCompare:(NSString *)string;