ios中传递CGpoint 结果错误
需要发送CGpoint 到主类中。使用了Notification，但是不知在接受端如何从Notification中提取出CGpoint。在log输出的结果是0.0
代码
发送:
``
NSValue *pointAsObject =[NSValue valueWithCGPoint:CGPointMake(touchDetectingView.lastTouchPosition.x, touchDetectingView.lastTouchPosition.y)];
[[NSNotificationCenter defaultCenter] postNotificationName: @"swap" object:pointAsObject];
接收端 Header 文件:- (void)incomingNotification:(NSNotification *)notification;
接受端 M 文件：[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(incomingNotification:) name:@"swap" object:nil];
-
(void)incomingNotification:(NSNotification *)notification
{NSValue *pointAsObject = [[notification userInfo] valueForKey:@"swap"]; NSLog (@"Successfully received the test notification %f",pointAsObject.CGPointValue.y);}
写回答
-
请看黑体字，你应该放到userinfo里传递，post的时候，而不是通过object传递
NSValue *pointAsObject =[NSValue valueWithCGPoint:CGPointMake(touchDetectingView.lastTouchPosition.x, touchDetectingView.lastTouchPosition.y)]; NSDictionary *dict = [NSDictionary dictionaryWithObject:pointAsObject forKey:@"point"]; [[NSNotificationCenter defaultCenter] postNotificationName: @"swap" object:self userinfo:dict];* **接收并处理消息
- (void)incomingNotification:(NSNotification *)notification { NSValue *pointAsObject = [[notification userInfo] valueForKey:@"point"]; NSLog (@"Successfully received the test notification %f",pointAsObject.CGPointValue.y); }2019-07-17 19:11:54赞同 展开评论 打赏
版权声明：本文内容由阿里云实名注册用户自发贡献，版权归原作者所有，阿里云开发者社区不拥有其著作权，亦不承担相应法律责任。具体规则请查看《阿里云开发者社区用户服务协议》和《阿里云开发者社区知识产权保护指引》。如果您发现本社区中有涉嫌抄袭的内容，填写侵权投诉表单进行举报，一经查实，本社区将立刻删除涉嫌侵权内容。
