我有一个 nsmutable 数组的 friend 列表。每个人都有他们的纬度和经度。我想用他们与 autor 的距离的升序对该数组进行排序。我发现了与 autor 的 friend 的距离值，现在我想要按照距离的升序对该数组进行排序。我就是这样做的，`
for(int i=0;i<[searchfriendarray count];i++)
{
NSDictionary *payload =[searchfriendarray objectAtIndex:i];
NSLog(@"%@",payload);
NSString *memberid = [payload objectForKey:@"userID"];
CLLocation *locationofauthor;
CLLocation *locationoffriends;
if([memberid isEqualToString:uidstr])
{
NSString *latofauthor = [payload objectForKey:@"latitude"];
NSString *longofauthor=[payload objectForKey:@"longitude"];
double latofauthordouble = [latofauthor doubleValue];
double longofauthordouble=[longofauthor doubleValue];;
locationofauthor = [[CLLocation alloc] initWithLatitude:latofauthordouble longitude:longofauthordouble];
}
else
{
NSString *latoffriends = [payload objectForKey:@"latitude"];
NSString *longoffriends=[payload objectForKey:@"longitude"];
double latoffriendsdouble = [latoffriends doubleValue];
double longoffriendsdouble=[longoffriends doubleValue];;
locationoffriends = [[CLLocation alloc] initWithLatitude:latoffriendsdouble longitude:longoffriendsdouble];
}
CLLocationDistance distance = [locationofauthor distanceFromLocation:locationoffriends];
}
`任何人都可以帮助我按照距离的升序对我的数组进行排序吗？
最佳答案
您可以提供两个对象之间的比较代码块。然后 NSArray 将根据需要多次调用您的 block 来对数组进行排序。
NSArray sortedArray = [yourUnsortedArray sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
/*some code to compare obj1 to obj2.
for instance, compare the distances of obj1 to obj2.
Then return an NSComparisonResult
(NSOrderedAscending, NSOrderedSame, NSOrderedDescending);*/
}];
附注要再次获取可变数组，只需对返回的对象调用 mutableCopy。
关于iphone - 如何按距离升序对 NSmutablearray 进行排序？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14660714/