NSArray排序

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- (NSArray<ObjectType> *)sortedArrayUsingFunction:(NSInteger (*)(ObjectType, ObjectType,void * __nullable))comparator context:(nullablevoid *)context;

- (NSArray<ObjectType> *)sortedArrayUsingFunction:(NSInteger (*)(ObjectType, ObjectType,void * __nullable))comparator context:(nullablevoid *)context hint:(nullableNSData *)hint;

- (NSArray<ObjectType> *)sortedArrayUsingSelector:(SEL)comparator;

第一种排序方法利用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:@"1",@"3",@"4",@"7",@"8",@"2",@"6",@"5",@"13",@"15",@"12",@"20",@"28",@"",nil];
    //排序前
    NSMutableString *outputBefore = [[NSMutableString alloc] init];
    for(NSString *str in sortArray){
        [outputBefore appendFormat:@",%@",str];
         }
         NSLog(@"排序前:%@",outputBefore);
         
         NSArray *array = [sortArray sortedArrayUsingFunction:customSort context:nil];
         
         NSMutableString *outputAfter = [[NSMutableString alloc] init];
         for(NSString *str in array){
             [outputAfter appendFormat:@",%@",str];
              }
         NSLog(@"排序后:%@",outputAfter);

//第二种，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:@"1",@"3",@"4",@"7",@"8",@"2",@"6",@"5",@"13",@"15",@"12",@"20",@"28",@"",nil];//排序前NSMutableString *outputBefore = [[NSMutableString alloc] init];for(NSString *str in sortArray){[outputBefore appendFormat:@"%@", str];}NSLog(@"排序前:%@",outputBefore);//排序后NSArray *array = [sortArray sortedArrayUsingComparator:cmptr];NSMutableString *outputAfter = [[NSMutableString alloc] init];for(NSString *str in array){[outputAfter appendFormat:@"%@", str];}NSLog(@"排序后:%@",outputAfter);

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:1];[_totalInfoArray sortUsingDescriptors:sortDescriptors];

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