KVC字符串转换不适用于BOOL值 [英] KVC string conversion not working for BOOL value

问题描述

嘿.我正在从文件中读取字符串，并尝试使用结果字符串使用KVC方法-setValue:forKeyPath:在对象上设置BOOL属性.但是，这会中断，但例外:-[NSCFString charValue]: unrecognized selector sent to instance 0x7fff711023b0.我猜这是因为BOOL是从char类型定义的.有没有解决的办法?谢谢！

Hey. I am reading in a string from a file and attempting to use the resulting string to set a BOOL property on an object using the KVC method -setValue:forKeyPath:. However, this breaks with an exception: -[NSCFString charValue]: unrecognized selector sent to instance 0x7fff711023b0. I'm guessing this is because BOOL is typedef'd from char. Is there a way around this? Thanks!

推荐答案

我正在捕获异常，检查它的名称，然后在需要时使用包装的值重试.这是代码:

I am catching the exception, checking it's name, and then retrying with a wrapped value when needed. Here is the code:

    @try
    {
        [(NSObject*)retObj setValue:[[obj keyValuePairs] objectForKey:key]
                         forKeyPath:key];
    }
    @catch (NSException * e)
    {
        if ([[e name] isEqualToString:NSInvalidArgumentException])
        {
            NSNumber* boolVal = [NSNumber numberWithBool:[[[obj keyValuePairs] objectForKey:key] boolValue]];
            [(NSObject*)retObj setValue:boolVal
                             forKeyPath:key];
        }
    }

还是谢谢！

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