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Giao thức này định nghĩa các phương pháp để xử lý tương tác với các tế bào. Một đại biểu bảng định nghĩa các phương pháp có nhu cầu xử lý, và các bảng điều khiển tự động xử lý các thông tin liên lạc giữa các giao diện người dùng và các đại biểu. (Tính sẵn có của | Simpo PDF Merge and Split Unregistered Version - http www.simpopdf.com A requirement for most Cocoa Touch web application clients is to provide authentication credentials such as a username and password for an account on the remote web service with which the mobile application interacts. The bouncer anti-pattern occurs when the Cocoa Touch application requires authentication credentials for operation but doesn t offer the option for creating those credentials inside the application. Instead the application opens Safari and forces registration through a web page or worse offers no option for registration at all. There are cases in which registration from a mobile application makes little sense. For example an application that allows you to check the balance in your savings account or retirement fund would require that the accounts already exist at the financial institution. The WordPress application requires external authentication using a WordPress-powered blog hosted on the Web. Because of this externality creating an account using only the iPhone application would be impossible. Rather than simply blocking access for new users the WordPress application allows access to information about the application and about WordPress. Figure 9-11 shows the WordPress application. Figure 9-11. The initial screen for new users of the WordPress application Most web applications are technically capable of allowing registration from any HTTP compatible client including Cocoa Touch applications. The ability to register from an application may be limited by the terms of service. If policy prevents registration applications should state as much and offer details on acceptable registration processes or sites. The LinkedIn and Facebook applications are good examples of applications that implement the bouncer anti-pattern. Figure 9-12 shows the LinkedIn and Facebook 158 Chapter 9 UX Anti-Patterns Download at Boykma.Com Simpo PDF Merge and Split Unregistered Version - http .