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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 , 6509 阅读

原文来自:http://iphone.ipsw.info/2009/10/nsmutablearray.html

 - (NSArray *)sortedArrayUsingSelector:(SEL)comparator

Parameters
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 = [self.name compare:[(MPURLRequestParameter *)inObject name]];

     if (result == NSOrderedSame) {

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

     }

 

      return result;

}

 

//////////////////////////////////////////////////////////

 

sortedArrayUsingFunction:适合基本类型(支持compare方法)

#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];

}

////////////////////////////////////////////////////////////////////

 

 

-(NSArray*)sortedMessages

{

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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