NSMutableArray 排序
2009年12月25日 05:17
原文来自：http://iphone.ipsw.info/2009/10/nsmutablearray.html
- (NSArray *)sortedArrayUsingSelector:(SEL)comparator
A selector that identifies the method to use to compare two elements at a time. The method should return @property (nonatomic, readwrite, retain) 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 allValues] sortedArrayUsingFunction:sortObjectsByLatestTimecontext:NULL]; } ////////////////////////////////////////////////////////// sortUsingDescriptors:适合元素是dict类型，initWithKey既是dict key. NSMutableArray *regions = [NSMutableArray array]; NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES]; NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor]; [regions sortUsingDescriptors:sortDescriptors]; [sortDescriptor release];Parameters
NSOrderedAscending 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:)];