Objective-C 类 -> 字符串如：[NSArray className] -> @"NSArray"
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Objective-C class -> string like: [NSArray className] -> @"NSArray"
提问by Alex Wayne
I am trying to get a string name of a class from the class object itself.
我试图从类对象本身获取类的字符串名称。
// For instance
[NSArray className]; // @"NSArray"
I have found object_getClassName(id obj)but that requires an instance be passed to it, and in my case that is needless work.
我发现object_getClassName(id obj)但这需要一个实例传递给它，在我的情况下这是不必要的工作。
So how can I get a string from a class object, and notan instance?
那么如何从类对象而不是实例中获取字符串呢？
回答by dreamlax
NSString *name = NSStringFromClass ([NSArray class]);
You can even go back the other way:
你甚至可以用另一种方式返回：
Class arrayClass = NSClassFromString (name);
id anInstance = [[arrayClass alloc] init];
回答by Sherwin Zadeh
Here's a different way to do it with slightly less typing:
这是一种不同的方法，可以稍微减少输入：
NSString *name = [NSArray description];
回答by wonder.mice
Consider this alternative:
考虑这个替代方案：
const char *name = class_getName(cls);
It's much faster, since it doesn't have to alloc NSString object and convert ASCII to whatever NSStringrepresentation is. That's how NSStringFromClass()is implemented.
它要快得多，因为它不必分配 NSString 对象并将 ASCII 转换为任何NSString表示形式。就是这样NSStringFromClass()实现的。
