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This is what the Apple Human Interface Guidelines for iOS have to say about this: If you must provide an optional alert message, write a short, complete sentence. If possible, keep the message short enough to be displayed on one or two lines. If the message is too long, it will scroll, giving users a poor experience. Use sentence-style capitalization and ...


This function does exactly that what you consider more natural; let people know whether or not people got the message through less explicit communication. It saves a crapload of confirmation messages that are just "ok". In real life, we can see if people are looking at us, how far away they are, if they're nodding or rolling their eyes. Basically, we get ...


The feature provides immediate feedback that the message has been read. This avoids having to send additional messages to confirm this. So the messages can focus on the actual content of the communication rather than the data transfer process.

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