iOS几种简单有效的数组排序方法

第一种，利用数组的sortedArrayUsingComparator调用 NSComparator ，obj1和obj2指的数组中的对象

 NSComparator cmptr = ^(id obj1, id obj2){
  if ([obj1 integerValue] > [obj2 integerValue]) {
         return (NSComparisonResult)NSOrderedDescending;
     }

     if ([obj1 integerValue] < [obj2 integerValue]) {
         return (NSComparisonResult)NSOrderedAscending;
     }
     return (NSComparisonResult)NSOrderedSame;
 };

 NSArray *sortArray = [[NSArray alloc] initWithObjects:@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",nil];

//排序前

  NSMutableString *outputBefore = [[NSMutableString alloc] init];
  for(NSString *str in sortArray){
   [outputBefore appendFormat:@"];
  }
  NSLog(@"排序前:%@",outputBefore);
  [outputBefore release];

 第一种排序

  NSArray *array = [sortArray sortedArrayUsingComparator:cmptr];

  NSMutableString *outputAfter = [[NSMutableString alloc] init];
  for(NSString *str in array){
   [outputAfter appendFormat:@"];
  }
  NSLog(@"排序后:%@",outputAfter);
  [outputAfter release];

第二种 排序方法 利用sortedArrayUsingFunction 调用 对应方法customSort，这个方法中的obj1和obj2分别是指数组中的对象。

 NSInteger customSort(id obj1, id obj2,void* context){
  if ([obj1 integerValue] > [obj2 integerValue]) {
         return (NSComparisonResult)NSOrderedDescending;
     }

     if ([obj1 integerValue] < [obj2 integerValue]) {
         return (NSComparisonResult)NSOrderedAscending;
     }
     return (NSComparisonResult)NSOrderedSame;
 }
  NSArray *sortArray = [[NSArray alloc] initWithObjects:@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",nil];

//排序前

  NSMutableString *outputBefore = [[NSMutableString alloc] init];
  for(NSString *str in sortArray){
   [outputBefore appendFormat:@"];
  }
  NSLog(@"排序前:%@",outputBefore);
  [outputBefore release];

  NSArray *array = [sortArray sortedArrayUsingFunction:customSort context:nil];

  NSMutableString *outputAfter = [[NSMutableString alloc] init];
  for(NSString *str in array){
   [outputAfter appendFormat:@"];
  }
  NSLog(@"排序后:%@",outputAfter);
  [outputAfter release];

第三种 利用sortUsingDescriptors调用NSSortDescriptor

  NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"price" ascending:NO];//其中，price为数组中的对象的属性，这个针对数组中存放对象比较更简洁方便
   NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:&sortDescriptor count:];
   [_totalInfoArray sortUsingDescriptors:sortDescriptors];
   [_airListView refreshTable:_totalInfoArray];
   [sortDescriptor release];
   [sortDescriptors release];

（有些乱，以后会进一步整理）