关于NSArray的几种排序：

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＃利用数组的sortedArrayUsingComparator调用 NSComparator

其中NSComparator其实就是一个返回NSComparisonResult的block。

typedef NSComparisonResult (^NSComparator)(id obj1,id obj2); 其中obj1、obj2其实是NSArray中的元素

    resultArray = [arrayDic <span style="color:#009900;">sortedArrayUsingComparator:</span>^NSComparisonResult(id obj1, id obj2) {        NSNumber * number1 = [[obj1 allKeys] objectAtIndex:0];        NSNumber * number2 = [[obj2 allKeys] objectAtIndex:0];        NSComparisonResult result = [number1 compare:number2];        return result == NSOrderedAscending;    }];

＃利用数组的sortedArrayUsingFunction 调用对应方法customSort

NSInteger <span style="color:#ff9900;">sortByID</span>(id obj1, id obj2, void *context){NSString *str1 =(NSString*) obj1; // ibj1 和 obj2 来自与你的数组中，其实，个人觉得是苹果自己实现了一个冒泡排序给大家使用NSString *str2 =(NSString *) obj2;if (str1.length < str2.length) {<span style="white-space:pre"></span>return NSOrderedDescending;}else if(str1.length == str2.length){<span style="white-space:pre"></span>return NSOrderedSame;}<span style="white-space:pre"></span>return NSOrderedAscending;}

NSArray *sortedArray =[arr sortedArrayUsingFunction:sortByID context:nil];

＃利用数组的sortedArrayUsingSelector调用对应的SEL的方法

注意selector的方法是对数组元素而言的方法，假如数据元素没有compare:方法，可以通过扩展数组元素的类增加相应的方法。

    NSMutableArray *arrayDic = [NSMutableArray arrayWithObjects:                             [NSDictionary dictionaryWithObjectsAndKeys:@"Obj0", [NSNumber numberWithInt:0], nil],                             [NSDictionary dictionaryWithObjectsAndKeys:@"Obj5", [NSNumber numberWithInt:5], nil],                             [NSDictionary dictionaryWithObjectsAndKeys:@"Obj2", [NSNumber numberWithInt:2], nil],                             [NSDictionary dictionaryWithObjectsAndKeys:@"Obj3", [NSNumber numberWithInt:3], nil],                             [NSDictionary dictionaryWithObjectsAndKeys:@"Obj1", [NSNumber numberWithInt:1], nil],                             [NSDictionary dictionaryWithObjectsAndKeys:@"Obj4", [NSNumber numberWithInt:4], nil], nil];#ifdef sortedArrayUsingSelector    resultArray = [arrayDic sortedArrayUsingSelector:@selector(compare:)];

因为数组中元素对应的是字典，所以对字典的类进行扩展

@implementation NSDictionary (extend)- (NSComparisonResult)compare: (NSDictionary *)otherDictionary{    NSNumber *number2 = [[otherDictionary allKeys] objectAtIndex:0];    NSDictionary *tempDictionary = (NSDictionary *)self;    NSNumber *number1 = [[tempDictionary allKeys] objectAtIndex:0];    NSComparisonResult result = [number1 compare:number2];    //    return result == NSOrderedDescending; // 升序      return result == NSOrderedAscending;  // 降序}

＃利用数组的sortUsingDescriptors调用NSSortDescriptor

NSSortDescriptor 可以简单的理解为指定对象的某属性的比较描述。

    /**     *  可以很方便的根据model对象中的某个属性进行排序     *   sortDescriptor1 数组根据name进行升序排     *   sortDescriptor2 数组根据age进行降序排     *   同时将两种sortDescriptor加入数组，是指先按照name排序，name相同的按照age排序     */    Person *person1 = [[Person alloc] init];    [person1 setName:@"ABC"];    [person1 setAge:24];        Person *person2 = [[Person alloc] init];    [person2 setName:@"ACB"];    [person2 setAge:22];        Person *person3 = [[Person alloc] init];    [person3 setName:@"ABD"];    [person3 setAge:33];    NSMutableArray *array = [NSMutableArray arrayWithObjects:person1, person2, person3, nil];    NSSortDescriptor *sortDescriptor1 = [NSSortDescriptor <span style="color:#ff0000;">sortDescriptorWithKey</span>:@"_name" ascending:YES];    NSSortDescriptor *sortDescriptor2 = [NSSortDescriptor <span style="color:#ff0000;">sortDescriptorWithKey</span>:@"_age" ascending:NO];    resultArray = [array sortedArrayUsingDescriptors:[NSArray arrayWithObjects:sortDescriptor1,sortDescriptor2,nil]];    for(NSInteger i = 0; i < [resultArray count]; i++)    {        NSLog(@"%@--------%d\n", [[resultArray objectAtIndex:i] name], [[resultArray objectAtIndex:i] age]);    }

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