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//创建一个数组
NSArray *array = @[@"zhangsan", @"lisi", @"zhonger", @"zhubada", @"honghunag"];
//创建一个排序条件,也就是一个NSSortDescriptor对象
//其中第一个参数为数组中对象要按照什么属性来排序(比如自身、姓名,年龄等)
//第二个参数为指定排序方式是升序还是降序
//ascending 排序的意思,默认为YES 升序
NSSortDescriptor *des = [[NSSortDescriptor alloc] initWithKey:@"self" ascending:YES];
NSArray *newArray = [array sortedArrayUsingDescriptors:@[des]];
NSLog(@"%@",newArray);
可以实现第一排序条件和第二排序条件
创建一个Person类
Person *p1 = [[Person alloc] initWithName:@"zhonger" age:@"19"];
Person *p2 = [[Person alloc] initWithName:@"zhubada" age:@"11"];
Person *p3 = [[Person alloc] initWithName:@"zhubada" age:@"1"];
Person *p4 = [[Person alloc] initWithName:@"zhubada" age:@"33"];
Person *p5 = [[Person alloc] initWithName:@"hehehe" age:@"38"];
NSArray *person = @[p1, p2, p3, p4, p5];
NSSortDescriptor *des1 = [[NSSortDescriptor alloc]initWithKey:@"name" ascending:YES];
NSSortDescriptor *des2 = [[NSSortDescriptor alloc] initWithKey:@"age" ascending:NO];
NSArray *newArray1 = [person sortedArrayUsingDescriptors:@[des1,des2]];
NSLog(@"%@",newArray1);
/*
使用NSSortDesriptor进行数组排序有三步
1.创建一个用来排序的数组
2.创建一个排序条件,初始化中需要指定按照数组中对象的什么属性进行排序,升序或者降序
3.数组根据排序条件进行排序,得到一个排序之后的数组(如果是可变数组,不会生成新数组,还是本身)
*/
使用的sortedArrayUsingSelecor:的方法,就不需要创建NSSortDescriptor
NSArray *strArray = @[@"zhonger", @"zhubada", @"qiuxiang", @"tangbohu", @"honghuang"];
NSArray *nesStr = [strArray sortedArrayUsingSelector:@selector(compare:)]; //SEL 只能用@selector(方法名)给定,并且,如果数组使用这个数组进行排序,此方法必须是返回值为NSComparisionResult
NSLog(@"newStr is %@",nesStr);
NSArray *personNewArray = [person sortedArrayUsingSelector:@selector(compareByName:)];
NSLog(@"--%@",personNewArray);
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原文地址:http://www.cnblogs.com/xueyao/p/5199547.html