Iphone postNotification正确触发函数,但userinfo(NSDictionary)没有任何内容
我使用下面的代码通知菜单选择索引Iphone postNotification正确触发函数,但userinfo(NSDictionary)没有任何内容,iphone,Iphone,我使用下面的代码通知菜单选择索引 NSDictionary *userInfo= [NSDictionary dictionaryWithObject:[NSString stringWithFormat:@"123"] forKey:@"Index"]; [[NSNotificationCenter defaultCenter] postNotificationName: @"noti
NSDictionary *userInfo= [NSDictionary dictionaryWithObject:[NSString stringWithFormat:@"123"]
forKey:@"Index"];
[[NSNotificationCenter defaultCenter] postNotificationName: @"notifyToMenuSelectionNotification"
object: userInfo];
-(void)menuSelectionNotification:(NSNotification *)notification
{
NSLog(@"%@", notification.userInfo);
}
菜单选择通知已正确触发
但是NSLog output notification.userInfo仍然是{null}
欢迎任何评论1您必须将词典设置为userInfo参数,而不是对象。你可能想试试
[[NSNotificationCenter defaultCenter] postNotificationName:@"notifyToMenuSelectionNotification" object:nil userInfo:userInfo];
您必须将字典设置为userInfo参数,而不是对象。你可能想试试
[[NSNotificationCenter defaultCenter] postNotificationName:@"notifyToMenuSelectionNotification" object:nil userInfo:userInfo];
您以错误的方式传递对象。请试试这个-
NSDictionary *userInfo= [NSDictionary dictionaryWithObject:[NSString stringWithFormat:@"123"]
forKey:@"Index"];
[[NSNotificationCenter defaultCenter] postNotificationName:@"notifyToMenuSelectionNotification"
object:nil
userInfo:userInfo];
您以错误的方式传递对象。请试试这个-
NSDictionary *userInfo= [NSDictionary dictionaryWithObject:[NSString stringWithFormat:@"123"]
forKey:@"Index"];
[[NSNotificationCenter defaultCenter] postNotificationName:@"notifyToMenuSelectionNotification"
object:nil
userInfo:userInfo];
您应该在userInfo参数中发布字典,如
[[NSNotificationCenter defaultCenter] postNotificationName:@"notifyToMenuSelectionNotification" object:nil userInfo:userInfo];
有关更多详细信息,请参见文档您应该在userInfo参数中发布字典,如
[[NSNotificationCenter defaultCenter] postNotificationName:@"notifyToMenuSelectionNotification" object:nil userInfo:userInfo];
有关更多详细信息,请参阅文档,请尝试以下操作
[[NSNotificationCenter defaultCenter] postNotificationName:@"notifyToMenuSelectionNotification" object:userInfo userInfo:nil];
-(void)menuSelectionNotification:(NSNotification *)notification{
NSDictionary *userInfo = (NSDictionary*)notification.object;
}
请试试这个
[[NSNotificationCenter defaultCenter] postNotificationName:@"notifyToMenuSelectionNotification" object:userInfo userInfo:nil];
-(void)menuSelectionNotification:(NSNotification *)notification{
NSDictionary *userInfo = (NSDictionary*)notification.object;
}
现在你有三个重复答案-选择一个随机答案来解决你的问题:现在你有三个重复答案-选择一个随机答案来解决你的问题: