【ios】如何按照自定义类的对象的某个属性进行排序

苹果自带的API

NSArray* sortedAry = [self.listPreDownloadScript sortedArrayUsingComparator:^NSComparisonResult(KEQMResourceItem *  _Nonnull obj1, KEQMResourceItem *  _Nonnull obj2) {            return obj1.downloadPriority > obj2.downloadPriority ? NSOrderedDescending : (obj1.downloadPriority == obj2.downloadPriority ? NSOrderedSame : NSOrderedAscending);        }];