Sort方法的擴充套件

oc中類方法中只為我們提供了一些降序方法,現在我們自己定義方法,實現公升序.

1.要求:定義乙個person類,例項變數包括name,age,height,定義幾個物件,把這些物件儲存在陣列中,自己定義方法,實現陣列按name,age,gheight的公升序排列輸出.

首先person.h檔案

#import @inte***ce person : nsobject

//初始化
- (id)initwithname:(nsstring *)name age:(nsinteger)age height:(cgfloat)height;
//姓名
- (void)setname:(nsstring *)name;
- (nsstring *)name;
//年齡
- (void)setage:(nsinteger)age;
- (nsinteger)age;
//身高
- (void)setheight:(cgfloat)height;
- (cgfloat)height;
//比較age
- (nscomparisonresult)comparebyage:(person *)anperson;
//比較身高
- (nscomparisonresult)comparebyheight:(person *)anperson;
//比較名字公升序
- (nscomparisonresult)comparebyname:(person *)anperson;
//名字降序
- (nscomparisonresult)comparebynamedesceding:(person *)anperson;

person.m檔案

#import "person.h"

@implementation person
#pragma mark - setter and getter
//set姓名
- (void)setname:(nsstring *)name
- (nsstring *)name
//set年齡
- (void)setage:(nsinteger)age
- (nsinteger)age
//set身高
- (void)setheight:(cgfloat)height
- (cgfloat)height
#pragma mark - init method
//初始化
- (id)initwithname:(nsstring *)name age:(nsinteger)age height:(cgfloat)height
return self;
}#pragma mark - override method
//重寫description
- (nsstring *)description
#pragma mark - compare
//比較年齡age
- (nscomparisonresult)comparebyage:(person *)anpersonelse if([self age] == [anperson age])else
}//比較身高
- (nscomparisonresult)comparebyheight:(person *)anpersonelse if([self height] == [anperson height])else
}//比較名字
- (nscomparisonresult)comparebyname:(person *)anperson
//名字降序
- (nscomparisonresult)comparebynamedesceding:(person *)anperson
@end

主函式中main.m呼叫

#import #import "person.h"

int main(int argc, const char * argv)
return 0;
}

測試結果:

2014-08-14 22:03:37.650 lesson_sort[4908:303] (

"name:dapeng age:30, height:190",

"name:xiaoguangguang age:20, height:180",

"name:xiaomeng age:22, height:175",

"name:xiaoshuai age:12, height:178" )

2014-08-14 22:03:37.651 lesson_sort[4908:303] (

"name:xiaoshuai age:12, height:178",

"name:xiaoguangguang age:20, height:180",

"name:xiaomeng age:22, height:175",

"name:dapeng age:30, height:190" )

2014-08-14 22:03:37.652 lesson_sort[4908:303] (

"name:xiaomeng age:22, height:175",

"name:xiaoshuai age:12, height:178",

"name:xiaoguangguang age:20, height:180",

"name:dapeng age:30, height:190" )

2014-08-14 22:03:37.652 lesson_sort[4908:303] (

"name:xiaoshuai age:12, height:178",

"name:xiaomeng age:22, height:175",

"name:xiaoguangguang age:20, height:180",

"name:dapeng age:30, height:190" )

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