单例模式的简单实用

JsonNero

于 2013-08-16 11:53:45 发布

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分类专栏： iOS 入门

本文链接：https://blog.youkuaiyun.com/wsxzk123/article/details/9999135

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本文通过一个简单的Objective-C示例介绍了单例模式的实现方式，并展示了如何利用KVC（键值编码）机制来设置和获取单例对象中的属性值。

单件模式实用的小例子 存取数据
@interface NSuser : NSObject

@property (nonatomic, strong)  NSString *name;

+(NSuser *)instance;
//+(id)instance;

@end
#import "NSuser.h"

static NSuser *user = nil;
@implementation NSuser

+(NSuser *)instance
//+(id)instance
{
    if (!user) {
        user = [[NSuser alloc] init];
    }
    return user;
}
@end
#import <Foundation/Foundation.h>
#import "NSuser.h"

int main(int argc, const char * argv[])
{

    @autoreleasepool {
        // 单例模式简单实用
        [[NSuser instance] setValue:@"xzk" forKey:@"name"];
        NSLog(@"%@", [[NSuser instance] valueForKey:@"name"]);
        
       //
       [NSuser instance].name = @"sdsd";
        NSLog(@"%@", [[NSuser instance] valueForKey:@"name"]);
    }
    return 0;
}

注：这里用的是KVC机制
[[NSuser instance] setValue:@"xzk" forKey:@"name"];
[[NSuser instance] valueForKey:@"name"];
不要和字典的
setValue: forKey:
objectForKey: