我有一个关于KVO的快速问题.我理解,对于NSArray,如果需要观察添加,您可以执行以下操作.
NSIndexSet* set = [NSIndexSet indexSetWithIndex:[someIndex integerValue]]; [self willChange:NSkeyvalueChangeInsertion valuesAtIndexes:set forKey:@"theArrayName"]; // add the objects at the specified indexes here [self didChange:NSkeyvalueChangeInsertion valuesAtIndexes:set forKey:@"theArrayName"];
但是,我不明白如何观察NSMutableDictionary的新对象添加.有没有办法观察对象的添加/删除?
谢谢,
[编辑]
我找到了满足当前需求的解决方案.我希望以下内容有助于未来的开发人员.
[self willChangeValueForKey:@"someDictionary" withSetMutation:NSkeyvalueUnionSetMutation usingObjects:[NSSet setWithObject:someObject]]; [Images setobject:someObject forKey:someIndex]; [self didChangeValueForKey:@"someDictionary" withSetMutation:NSkeyvalueUnionSetMutation usingObjects:[NSSet setWithObject:someObject]];
解决方法
只是为了确保回答问题.信用转到@DoubleDunk
[self willChangeValueForKey:@"someDictionary" withSetMutation:NSkeyvalueUnionSetMutation usingObjects:[NSSet setWithObject:someObject]]; [Images setobject:someObject forKey:someIndex]; [self didChangeValueForKey:@"someDictionary" withSetMutation:NSkeyvalueUnionSetMutation usingObjects:[NSSet setWithObject:someObject]];
原文地址:https://www.jb51.cc/iOS/331276.html
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。