IOS几种简单有效的数组排序方法

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转载最新推荐文章于 2026-07-29 14:56:38 发布 572 阅读 AI 写同款· GEO 优化 ›

2023华为OD机试真题B卷 Python 实现【最长的元音子串长度】定义当一个字符串只有元音字母(a,e,i,o,u,A,E,I,O,U)组成,称为元音字符串，现给定一个字符串，请找出其中最长的元音字符串，并返回其长度，如果找不到请返回0，字符串中任意一个连续字符组成的子序列称为该字符串的子串阅读详情

//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:@"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:@"];
}
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:@"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:@"];
}
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:1];
  [_totalInfoArray sortUsingDescriptors:sortDescriptors];
  [_airListView refreshTable:_totalInfoArray];
  [sortDescriptor release];
  [sortDescriptors release];