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Yes, the secrets behind the successful development of iPhone App are revealed. These secrets are shared by top-notch iOS developers. It is easy to develop a phenomenal iOS app if your follow these during your iPhone app development.
The secret is SIMPLE . Secret is THE USER
Content should always fit the screen size of the app and it is important for good user experience by avoiding the hassle to scroll left or right. It is highly recommended to keep the layout fluid and intuitive so try avoiding excessive shadowing and gradients. keep font user friendly so that user need not struggle to see the content when accessing the app outside under the sun.
Use Error handling to effectively handle any logical error. I hope you need not want user to have an impression that this particular app is highly prone to crash.