DYSafeObject (cocoapods): 防止 字典value为nil、数组越界、<null>、NSNull对象导致的Crash.
Keywords: afnetworking|arkit|aspects|awesome|beng-k|crash|crash-safe|mvvm|nsarray|nsdictionary|nsnull|object-detection|objective-c|runtime|swizzle|swizzle-method|zu-jian-hua