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驾驶题库 1.2 发布

NSMutableArray 排序

Chirpware posted @ 2009年12月25日 05:17 in iphone开发 with tags NSMutableArray 排序 sort iphone , 6445 阅读


 - (NSArray *)sortedArrayUsingSelector:(SEL)comparator


A selector that identifies the method to use to compare two elements at a time. The method should returnNSOrderedAscending if the receiver is smaller than the argument, NSOrderedDescending if the receiver is larger than the argument, and NSOrderedSame if they are equal


NSArray *sortedArray =
    [anArray sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];



@property (nonatomicreadwriteretain) NSMutableArray *parameters;


[self.parameters sortUsingSelector:@selector(compare:)];



#pragma mark -


- (NSComparisonResult)compare:(id)inObject {

     NSComparisonResult result = [ compare:[(MPURLRequestParameter *)inObject name]];

     if (result == NSOrderedSame) {

result = [self.value compare:[(MPURLRequestParameter *)inObject value]];



      return result;






#pragma mark SORT METHOTDS

NSInteger sortObjectsByLatestTime(id obj1, id obj2, void *context)



NSDate* d1 = [(MessageGroup*)obj1 latestTime];

NSDate* d2 = [(MessageGroup*)obj2 latestTime];

//sort by desc

return [d2 compare:d1];



NSInteger dateSort(id obj1, id obj2, void *context)


NSDate* d1 = ((Inbox*)obj1).datetime;

NSDate* d2 = ((Inbox*)obj2).datetime;

return [d1 compare:d2];







return [[groupMessages allValuessortedArrayUsingFunction:sortObjectsByLatestTimecontext:NULL];



sortUsingDescriptors:适合元素是dict类型,initWithKey既是dict key.


NSMutableArray *regions = [NSMutableArray array];



NSSortDescriptor *sortDescriptor = [[NSSortDescriptor allocinitWithKey:@"name" ascending:YES];

NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor];

[regions sortUsingDescriptors:sortDescriptors];

[sortDescriptor release];

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