IOS开发之利用单例模式完成两个ViewController之间的传值

单例文件内容如下

.h

@interface Single:NSObject

@property(nonatomic, copy)NSURL *value;

+(instancetype)sharedInstance;
@end

.m

@implementation Single


+(instancetype)sharedInstance{
    static Single *myInstance = nil;
    if(myInstance == nil){
        myInstance = [[Single alloc]init];
    }
    return myInstance;
}

@end

A向Bcontroller传值

A里导入单例类

  [Single sharedInstance].value=toUrl;

B中

NSURL *url=[Single sharedInstance].value;

这是最简单的一种页面间传值方法

测试打印结果如下

2020-06-19 11:20:58.596871+0800 RecordDem[1443:469673]页面二准备复制给单例对象的URL是file:///var/mobile/Containers/Data/Application/6887E45D-0C41-4CD0-8D7A-5829C3B36571/Documents/2020-06-18-20:16:03.caf

2020-06-19 11:20:54.763083+0800 RecordDem[1443:469673] 页面三file:///var/mobile/Containers/Data/Application/6887E45D-0C41-4CD0-8D7A-5829C3B36571/Documents/2020-06-18-20:16:03.caf

页面3顺利拿到了页面2传的URL值