在没有编程的10年后(当时在Delphi中),我开始学习 Objective-C的。我承认我遇到了很多问题,因为这种方法非常不同。
我想创建一个简单的表,其中每行包含几个 NSString变量。一个例子:
ID Firstname Lastname
01 FN1 LN1
02 FN2 LN2
我的表:
NSString * FirstName, * LastName;
NSMutableArray * person = [NSMutableArray arrayWithObjects: firtsname, lastname, nil];
问题在于我无法添加包含2个NSString的行,例如:
FirstName = @ "FN1";
LastName = @ "LN1";
[person AddObject: FirstName, LastName];
FirstName = @ "FN2";
LastName = @ "LN2";
[person AddObject: FirstName, LastName];
//etc. ...
我知道AddObject只能添加1个对象,但它是为了解释我的例子的概念。
如何在我的示例中同时添加2个对象?
然后,我如何管理/检索对象NString“1”(firstName)& NString“2”(lastName)由索引(i);
我承认我找不到发展的逻辑,你的回答会非常有帮助。
非常感谢您的回复。
编辑:
我有一个奇怪的问题。我的.m:
Person *pers = [[Person alloc]init];
NSMutableArray *myarray = [[NSMutableArray alloc] init];
[pers setFirstName:@"FN 1"]; // = pers.firstName;
[pers setLastName:@"LN 1"]; // = pers.lastName;
[myarray addObject:pers];
[pers setFirstName:@"FN 2"];
[pers setLastName:@"LN 2"];
[myarray addObject:pers];
[pers release];
NSLog(@"count: %d", [myarray count]);
for(int i = 0; i < [myarray count]; i++)
{
pers = [myarray objectAtIndex:i];
NSLog(@"%d %@ %@ %@", i, pers, pers.firstName, pers.lastName);
}
[myarray release];
我的NSLog是: 2011-04-27 19:07:57.582 temp [11724:903] count:2
2011-04-27 19:07:57.584 temp [11724:903] 0 FN 2 LN 2
2011-04-27 19:07:57.585 temp [11724:903] 1 FN 2 LN 2
如你所见,我有两次FN 2 LN 2。对象“pers”具有两倍相同的值
正常吗?
答案 0 :(得分:2)
最简单的方法是制作一个非常简单的模型类:
“Person.h”
#import <Foundation/Foundation.h>
@interface Person : NSObject {
NSString *firstName;
NSString *lastName;
}
@property (readwrite, copy) NSString *firstName;
@property (readwrite, copy) NSString *lastName;
@end
“Person.m”
#import "Person.h"
@implementation Person
@synthesize firstName, lastName;
- (void)dealloc
{
[firstName release];
firstName = nil;
[lastName release];
lastName = nil;
[super dealloc];
}
@end
这将允许您使用addObject:
,因为它在技术上是一个对象,您只能在其中存储多个数据。一个例子如下:
//...
Person *p1 = [[Person alloc] init];
[p1 setFirstName:@"First Name"];
[p2 setLastName:@"Last Name"];
[personArray addObject:p1];
[p1 release];
//...
如果您不熟悉@property
或@synthesize
我会recommend this article explaining both。
为了响应编辑,您可以使用以下内容获取值:
Person *peep = [personArray objectAtIndex:i];
NSString *firstName = [peep firstName]; //or you could use peep.firstName;
NSString *lastName = [peep lastName];
答案 1 :(得分:1)
试试这个:
NSDictionary *person = [[NSDictionary alloc] initWithObjectsAndKeys:
@"Bill", @"Firstname",
@"Gates", @"Lastname", nil];
NSMutableArray *storage = [[[NSMutableArray alloc] init] autorelease];
[storage addObject:person];
[person release];