NSArray排序

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转载自：http://www.cocoachina.com/bbs/read.php?tid-75375.html

NSMutableArray *array = [[NSMutableArrayalloc] init];

[array addObject:[NSNumbernumberWithInt:1]];

[array addObject:[NSNumbernumberWithInt:3]];

[array addObject:[NSNumbernumberWithInt:2]];

NSArray *sorteArray = [array sortedArrayUsingComparator:^(id obj1, id obj2){

if ([obj1 integerValue] > [obj2integerValue]) {

return (NSComparisonResult)NSOrderedDescending;

}

if ([obj1 integerValue] < [obj2integerValue]) {

return (NSComparisonResult)NSOrderedAscending;

}

return (NSComparisonResult)NSOrderedSame;

}];

NSLog(@"%@",sorteArray); //从小到大

NSArray *array2 = [array sortedArrayUsingComparator:^(id obj1, id obj2){

if ([obj1 integerValue] > [obj2integerValue]) {

return (NSComparisonResult)NSOrderedAscending;

}

if ([obj1 integerValue] < [obj2integerValue]) {

return (NSComparisonResult)NSOrderedDescending;

}

return (NSComparisonResult)NSOrderedSame;

}];

NSLog(@"%@",array2);

另外可以这样写：
NSMutableArray *ma1 = [[NSMutableArray alloc] init];
    [ma1 addObject:@"2"];
    [ma1 addObject:@"1"];
    [ma1 addObject:@"3"];

    NSSortDescriptor *sd1 = [NSSortDescriptor sortDescriptorWithKey:@"self" ascending:NO];
    NSArray *arr1 = [ma1 sortedArrayUsingDescriptors:[NSArray arrayWithObjects:sd1, nil]];

    for (NSString *str in arr1) {
        NSLog(@"%@", str);
    }