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问题描述
我有以下代码片段：
NSString* value = @"value";
NSString* key = @"key";
NSMutableDictionary* foo = [NSMutableDictionary dictionary];
NSDictionary* bar = [NSDictionary dictionary];
NSAssert([bar isKindOfClass: [NSMutableDictionary class]], @""); // passes the assert as both are NSCFDictionary;
NSAssert([bar respondsToSelector: @selector(setValue:forKey:)], @""); // passes the assert because it NSCFDictionary does respond to the selector
[foo setValue:value forKey:key]; // no problem, foo is mutable
[bar setValue:value forKey:key]; // crash
所以如果我的对象是 NSDictionary 或 NSMutableDictionary ，缺少try块（我宁愿避免），我该如何区分？
So if I have an object which is either an NSDictionary or an NSMutableDictionary, short of a try block (which I'd rather avoid), how can I tell the difference?
推荐答案
NSAssert([bar isMemberOfClass: [NSMutableDictionary class]], @"");
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