Looks like it should be easy: Landscape text box scrolling
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Are you using Interface Builder to create a view? In this case, adding a UITextField to a UIView in landscape mode. If you don't know how to use IB to create views in landscape mode, open a UIView object in IB. There is a small arrow in the upper right corner of the window. Click this arrow to rotate the view to landscape mode.
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Modify the Info.plist file to include the Initial Device Orientation key and point to UIDeviceOrientationLandscapeLeft (the Home button should be on the right if the app opens in landscape orientation as recommended by Apple UI). Some samples come with this property already in the plist, but most don't.
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