NSArray?*arr?=?@[ @"234", @"123", @"235", @"133" ]; NSArray?*sortArr?=?[arr?sortedArrayUsingSelector:@selector(compare:)]; NSLog(@"%@",sortArr);//用要排序的原數組調用實例方法，第二個參數，是方法選擇，如果數組的元素都是字符串，那么直接用compare:就行 //block(代碼塊)排序 NSArray?*sortArr2?=?[arr?sortedArrayUsingComparator:^NSComparisonResult(id?obj1,?id?obj2)?{ return?[obj1?compare:obj2];//根據比較結果，如果結果是1，則交換 }]; NSLog(@"%@",sortArr2); main函數 Student *s = [[Student alloc] init];
??????? s.name = @"zhangyu";
??????? s.age = 20;
???????
??????? Student *s1 = [[Student alloc] init];
???????
??????? s1.name = @"zhangyuzi";
??????? s1.age = 18;
???????
??????? Student *s2 = [[Student alloc] init];
??????? s2.age = 21;
??????? s2.name = @"lirongsheng";
???????
??????? NSArray *arr = @[
???????????????????????? s,
???????????????????????? s1,
???????????????????????? s2
???????????????????????? ];
???????
???????
??????? //自定義對象排序
??????? NSArray *stuArr = [arr sortedArrayUsingSelector:@selector(compareWithAge:)];
??????? NSLog(@"%@",stuArr);
??? }
??? return 0; } main.h #import <Foundation/Foundation.h>

@interface Student : NSObject

@property (nonatomic, strong) NSString *name;
@property (nonatomic, assign) int age;

//自定義比較方法（排序時調用）,要遵循compare:方法
//格式：-(NSComparisonResult)方法名:(要比較的類名 *)參數名

-(NSComparisonResult)compareWithName:(Student *)stu;

-(NSComparisonResult)compareWithAge:(Student *)stu;
@end main.m #import "Student.h"

@implementation Student

-(NSString *)description{
??? return [NSString stringWithFormat:@"%@,%d",_name,_age];
}

//比較方法的實現
-(NSComparisonResult)compareWithName:(Student *)stu{
??? //對象的比較結果就相當于屬性比較結果，self,最開始代表第0個元素，后面再比較時，代表交換后的滿足條件的對象
??? /*
???? 0? self a[0];
???? 1? self a[1]
???? 2? self a[2]
???? */
??? //當self放在第一個參數是，代表升序，放在第二個參數時，代表降序??? 只有result為1的時候才進行交換
??? NSComparisonResult result = [stu.name compare: self.name];
???
??? return result;
}

-(NSComparisonResult)compareWithAge:(Student *)stu{
??? NSComparisonResult result;
???
??? if (self.age < stu.age) {
??????? result = 1;
??? }else{
??????? result = -1;
??? }
???
??? return? result;
}
@end

轉載于:https://www.cnblogs.com/zhangyu666666/p/4931124.html

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