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

 1 NSComparator cmptr = ^(id obj1, id obj2){
 2  if ([obj1 integerValue] > [obj2 integerValue]) {
 3         return (NSComparisonResult)NSOrderedDescending;
 4     }
 5  
 6     if ([obj1 integerValue] < [obj2 integerValue]) {
 7         return (NSComparisonResult)NSOrderedAscending;
 8     }
 9     return (NSComparisonResult)NSOrderedSame;
10 };
11 
12 NSArray *sortArray = [[NSArray alloc] initWithObjects:@"1",@"3",@"4",@"7",@"8",@"2",@"6",@"5",@"13",@"15",@"12",@"20",@"28",@"",nil];

//排序前

1  NSMutableString *outputBefore = [[NSMutableString alloc] init];
2  for(NSString *str in sortArray){
3   [outputBefore appendFormat:@"];
4  }
5  NSLog(@"排序前:%@",outputBefore);
6  [outputBefore release];

第一种排序

1  NSArray *array = [sortArray sortedArrayUsingComparator:cmptr];
2  
3  NSMutableString *outputAfter = [[NSMutableString alloc] init];
4  for(NSString *str in array){
5   [outputAfter appendFormat:@"];
6  }
7  NSLog(@"排序后:%@",outputAfter);
8  [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。

 1 NSInteger customSort(id obj1, id obj2,void* context){
 2  if ([obj1 integerValue] > [obj2 integerValue]) {
 3         return (NSComparisonResult)NSOrderedDescending;
 4     }
 5  
 6     if ([obj1 integerValue] < [obj2 integerValue]) {
 7         return (NSComparisonResult)NSOrderedAscending;
 8     }
 9     return (NSComparisonResult)NSOrderedSame;
10 }
11  NSArray *sortArray = [[NSArray alloc] initWithObjects:@"1",@"3",@"4",@"7",@"8",@"2",@"6",@"5",@"13",@"15",@"12",@"20",@"28",@"",nil];

//排序前

 1  NSMutableString *outputBefore = [[NSMutableString alloc] init];
 2  for(NSString *str in sortArray){
 3   [outputBefore appendFormat:@"];
 4  }
 5  NSLog(@"排序前:%@",outputBefore);
 6  [outputBefore release];
 7  
 8  NSArray *array = [sortArray sortedArrayUsingFunction:customSort context:nil];
 9  
10  NSMutableString *outputAfter = [[NSMutableString alloc] init];
11  for(NSString *str in array){
12   [outputAfter appendFormat:@"];
13  }
14  NSLog(@"排序后:%@",outputAfter);
15  [outputAfter release];

第三种利用sortUsingDescriptors调用NSSortDescriptor

1  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
2   NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:&sortDescriptor count:1];
3   [_totalInfoArray sortUsingDescriptors:sortDescriptors];
4   [_airListView refreshTable:_totalInfoArray];
5   [sortDescriptor release];
6   [sortDescriptors release];

（有些乱，以后会进一步整理）