1         //使用块对数组排序 2         NSArray* arr = @[@"4",@"3",@"1",@"2"]; 3         NSMutableArray* mutArr = [arr mutableCopy]; 4          5         //可变数组使用块 sortUsingComparator 6         [mutArr sortUsingComparator:^NSComparisonResult(id obj1, id obj2) { 7             return [obj1 compare: obj2]; 8         }]; 9         //不可变数组使用Comparator排序10         NSArray* sorted = [arr sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {11             return [obj2 compare: obj1];12         }];13         14         NSLog(@"%@", sorted);15          NSLog(@"%@", mutArr);16 17         //使用块对数组进行排序18         //可变数组使用selector排序19         NSLog(@"%@", [arr sortedArrayUsingSelector:@selector(compare:)]);

 1 #import <Foundation/Foundation.h> 2 @class Grade; 3 @interface Student : NSObject 4 @property (copy, nonatomic) NSString* name; 5 @property (assign, nonatomic) NSInteger age; 6 @property (copy, nonatomic) NSString* stuNo; 7 @property (strong, nonatomic) Grade* grade; 8 - (NSComparisonResult)compare:(Student *)stu; 9 10 - (NSString *)description;11 12 @end13 14 @implementation Student15 - (NSComparisonResult)compare:(Student *)stu16 {17     return [_name compare: [stu name]];18 }19 - (NSString *)description20 {21     return [NSString stringWithFormat:@"%@", _name];22 }23 @end

 1 //对自定义对象进行排序 2         Grade* grade1 = [[Grade alloc] init]; 3         grade1.name = @"1023"; 4         Grade* grade2 = [[Grade alloc] init]; 5         grade2.name = @"1024"; 6          7         Student* stu1 = [[Student alloc] init]; 8         stu1.name = @"悟空"; 9         stu1.stuNo = @"008";10         stu1.age = 10;11         stu1.grade = grade1;12         Student* stu2 = [[Student alloc] init];13         stu2.name = @"八戒";14         stu2.stuNo = @"007";15         stu2.age = 12;16         stu2.grade = grade2;17         Student* stu3 = [[Student alloc] init];18         stu3.name = @"唐僧";19         stu3.stuNo = @"009";20         stu3.age = 14;21         stu3.grade = grade2;22         Student* stu4 = [[Student alloc] init];23         stu4.name = @"玉帝";24         stu4.stuNo = @"011";25         stu4.age = 16;26         stu4.grade = grade1;27         Student* stu5 = [[Student alloc] init];28         stu5.name = @"观音";29         stu5.stuNo = @"112";30         stu5.age = 14;31         stu5.grade = grade1;32         33         NSArray* students = @[stu1, stu2, stu3, stu4,stu5];34         //对自定义对象排序需要自定义排序方法35         NSArray* orderedArr = [students sortedArrayUsingSelector:@selector(compare:)];36 //        NSLog(@"%@", orderedArr);37         for (Student *new in orderedArr) {38             NSLog(@"%@", new.name);39         }

1 　　　　　//使用NSSortDescriptor对象描述某一条属性的比较规则2         //第一个参数，是要比较的属性所对应的成员变量的名字3         //第二个参数，指定为YES, 表示为升序，指定为NO,表示为降序4         5         NSSortDescriptor* desc1 = [[NSSortDescriptor alloc] initWithKey:@"_stuNo" ascending:YES];6         NSSortDescriptor* desc2 = [[NSSortDescriptor alloc] initWithKey:@"_age" ascending:YES];7         NSSortDescriptor* desc3 = [[NSSortDescriptor alloc] initWithKey:@"_name" ascending:YES];8         //【注】NSSortDescriptor 支持路径，_grade为student对象的属性对象，name为_grade的属性9         NSSortDescriptor* desc4 = [[NSSortDescriptor alloc] initWithKey:@"_grade.name" ascending:YES];

1 NSArray* descArr = [NSArray arrayWithObjects: desc4,desc1, desc3, desc2, nil];

1 NSArray* sortedByDescriptor = [students sortedArrayUsingDescriptors: descArr];

 1 #import <Foundation/Foundation.h> 2 @class Grade; 3 @interface Student : NSObject 4 @property (copy, nonatomic) NSString* name; 5 @property (assign, nonatomic) NSInteger age; 6 @property (copy, nonatomic) NSString* stuNo; 7 @property (strong, nonatomic) Grade* grade; 8 - (NSComparisonResult)compare:(Student *)stu; 9 10 - (NSString *)description;11 12 @end

 1 #import "Student.h" 2  3 @implementation Student 4 - (NSComparisonResult)compare:(Student *)stu 5 { 6     return [_name compare: [stu name]]; 7 } 8 - (NSString *)description 9 {10     return [NSString stringWithFormat:@"%@", _name];11 }12 @end

1 #import <Foundation/Foundation.h>2 3 @interface Grade : NSObject4 @property (copy, nonatomic) NSString* name;5 @end

1 #import "Grade.h"2 3 @implementation Grade4 5 @end

 1 //对自定义对象进行排序 2         Grade* grade1 = [[Grade alloc] init]; 3         grade1.name = @"1023"; 4         Grade* grade2 = [[Grade alloc] init]; 5         grade2.name = @"1024"; 6          7         Student* stu1 = [[Student alloc] init]; 8         stu1.name = @"悟空"; 9         stu1.stuNo = @"008";10         stu1.age = 10;11         stu1.grade = grade1;12         Student* stu2 = [[Student alloc] init];13         stu2.name = @"八戒";14         stu2.stuNo = @"007";15         stu2.age = 12;16         stu2.grade = grade2;17         Student* stu3 = [[Student alloc] init];18         stu3.name = @"唐僧";19         stu3.stuNo = @"009";20         stu3.age = 14;21         stu3.grade = grade2;22         Student* stu4 = [[Student alloc] init];23         stu4.name = @"玉帝";24         stu4.stuNo = @"011";25         stu4.age = 16;26         stu4.grade = grade1;27         Student* stu5 = [[Student alloc] init];28         stu5.name = @"观音";29         stu5.stuNo = @"112";30         stu5.age = 14;31         stu5.grade = grade1;32         33         NSArray* students = @[stu1, stu2, stu3, stu4,stu5];34 35 NSSortDescriptor* desc1 = [[NSSortDescriptor alloc] initWithKey:@"_stuNo" ascending:YES];36         NSSortDescriptor* desc2 = [[NSSortDescriptor alloc] initWithKey:@"_age" ascending:YES];37         NSSortDescriptor* desc3 = [[NSSortDescriptor alloc] initWithKey:@"_name" ascending:YES];38         //可向下传递39         NSSortDescriptor* desc4 = [[NSSortDescriptor alloc] initWithKey:@"_grade.name" ascending:YES];40         NSArray* descArr = [NSArray arrayWithObjects: desc4,desc1, desc3, desc2, nil];41 //        NSArray* descArr = [NSArray arrayWithObjects:desc4, nil];42         NSArray* sortedByDescriptor = [students sortedArrayUsingDescriptors: descArr];43         44         for (Student *new in sortedByDescriptor) {45             NSLog(@"%@", new.grade.name);46         }