Runtime-重写description打印对象信息#

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-(NSString *)description
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{
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    NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
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    uint count;
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    objc_property_t *properties = class_copyPropertyList([self class], &count);
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    for (int i = 0; i<count; i++) {
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        objc_property_t property = properties[i];
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        NSString *name = @(property_getName(property));
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        id value = [self valueForKey:name]?:@"nil";
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       [dictionary setObject:value forKey:name];
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    }
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    free(properties);
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    return [NSString stringWithFormat:@"<%@: %p> -- %@",[self class],self,dictionary];
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}