NSArray数字和排序

1.数字

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        //添加空白 [NSNull null]
//        NSArray *arr=[NSArray arrayWithObjects:@1,@2,[NSNull null],@3,nil];
//                for (id a in arr) {
//            NSLog(@"%@",a);
//
//        }

        //添加数字
//        NSNumber *arr=[NSNumber numberWithInt:10];
//        NSLog(@"%@",arr);
        //数值类型转整形
//        NSLog(@"%d",[arr intValue]);

        NSNumber *num1=[NSNumber numberWithInt:];
        NSNumber *num2=[NSNumber numberWithInt:];
        NSNumber *num3=[NSNumber numberWithInt:];
        NSArray *numArr=[NSArray arrayWithObjects:num1,num2,num3,nil];
        for (id a in numArr) {
//            NSLog(@"%@",a);
           NSLog(@"%d",[a intValue]+);
        }

//        NSArray *arr=[NSArray arrayWithObjects:@1,@2,@3,nil];

    }
    return ;
}

2.排序1

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
//        NSArray *arr=@[@"lisi",@"wangwu",@"zhansan"];
//        NSLog(@"%@",arr);
//        NSArray *str=@[@"ABC",@"BCD",@"FDFSFDS",@"ACV"];
//        NSArray *nums=@[@12,@10,@60,@20,@30];
        //不可变集合的数组排序
//        NSArray *sortedArray = [nums sortedArrayUsingSelector:@selector(compare::)];
//        NSLog(@"%@",sortedArray);

    }
    return ;
}

2.1类排序

#import <Foundation/Foundation.h>
#import "Student.h"
int main(int argc, const char * argv[]) {
    @autoreleasepool {
        Student *sunwukong=[[Student alloc] init];
        sunwukong.name=@"sunwukong";
        sunwukong.age= ;

        Student *zhubajie=[[Student alloc] init];
        zhubajie.name=@"zhubajie";
        zhubajie.age=;

        Student *shaheshang=[[Student alloc] init];
        shaheshang.name=@"shaheshang";
        shaheshang.age=;

        NSArray *qujignTeam=@[sunwukong,zhubajie,shaheshang];
      //选择器排序法
        /**
         *  通过自定义的选择器实现按照姓名的升序排序
         *
         *  @param mySortNameAsc: 自定义排序方法
         *
         *  @return
         */
//        NSArray *newTeam=[qujignTeam sortedArrayUsingSelector:@selector(mySortNameAsc:)];
//        for (Student *team in newTeam) {
//            NSLog(@"%@",team);
//        }
        //年龄排序
//        NSArray *newAge=[qujignTeam sortedArrayUsingSelector:@selector(mySortAgeAsc:)];
//        for (Student *Aage in newAge) {
//            NSLog(@"%@",Aage);
//        }
            /**
             *  描述信息排序
             */
        NSSortDescriptor *sortDesc=[NSSortDescriptor sortDescriptorWithKey:@"age" ascending:YES];
        NSArray *newTeam=[qujignTeam sortedArrayUsingDescriptors:@[sortDesc]];
        for (Student *s in newTeam) {
            NSLog(@"%@",s);
        }
    }
　　　　　

NSArray *newTeam1=[qujignTeam sortedArrayUsingComparator:^NSComparisonResult(Student *obj1,Student *obj2) {

return [obj1.name compare:obj2.name];

}];

for (Student *stu in newTeam1) {

NSLog(@"%@",stu);

}

return ;

}

#import <Foundation/Foundation.h>

@interface Student : NSObject
@property(strong,nonatomic)NSString *name;
@property(assign,nonatomic)int age;
/**
 *  按照姓名的升序排序
 *
 *  @param obj stu对象
 *
 *  @return  枚举 -1，0，+1
 */
-(NSComparisonResult)mySortNameAsc:(Student *) obj;
-(NSComparisonResult)mySortNameDesc:(Student *) obj;
-(NSComparisonResult)mySortAgeAsc:(Student *) obj;
-(NSComparisonResult)mySortAgeDesc:(Student *)obj;
@end

#import "Student.h"

@implementation Student
- (NSString *)description
{
    return [NSString stringWithFormat:@"%@,%d", _name,_age];
}
-(NSComparisonResult)mySortNameAsc:(Student *) obj{
    //通过姓名属性进行比较
   return [self.name compare:obj.name];

}
-(NSComparisonResult)mySortNameDesc:(Student *)obj{
    return [obj.name compare:self.name];

}
/**
 *  按照年龄进行升序排序
 *
 *  @param obj stu对象
 *
 *  @return 返回升序的结果
 */
-(NSComparisonResult)mySortAgeAsc:(Student *)obj{
    if(self.age>obj.age){
        return NSOrderedDescending;
    }else if(self.age<obj.age){
        return NSOrderedAscending;
    }else{
        return NSOrderedSame;
    }
}
-(NSComparisonResult)mySortAgeDesc:(Student *)obj{
    if(self.age>obj.age){
        return NSOrderedAscending;
    }else if(self.age<obj.age){
        return NSOrderedDescending;
    }else{
        return NSOrderedSame;
    }
}
@end