iOS 7 Programming Cookbook by Vandad Nahavandipoor

By Vandad Nahavandipoor

Conquer the vexing concerns you're more likely to face whilst growing apps for the iPhone, iPad, or iPod contact. With new and carefully revised recipes during this up to date cookbook, you'll quick examine the stairs essential to paintings with the iOS 7 SDK, together with options for bringing real-world physics and circulation on your apps with UIKit Dynamics APIs.

You'll research thousands of thoughts for storing and conserving info, sending and receiving notifications, improving and animating portraits, coping with documents and folders, and plenty of different techniques. each one recipe comprises pattern code you should use straight away.

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The index of that button will be passed to us as the buttonIndex parameter of the alertView:clickedButtonAtIndex: meth‐ od, but if you need the title of that button, you will then need to use the buttonTitleA tIndex: method of UIAlertView. That is it; job done! You can also use an alert view for text entry, such as to ask the user for his credit card number or address. For this, as mentioned before, we need to use the UIAlert ViewStylePlainTextInput alert view style. 1. info | 29 [alertView show]; } If you run your app on the simulator now, you will get a result similar to Figure 1-4.

We can go ahead now and create our switch. mainSwitch]; } So we are allocating an object of type UISwitch and using the initWithFrame: initializer to initialize our switch. Note that the parameter that we have to pass to this method is of type CGRect. A CGRect denotes the boundaries of a rectangle using the (x,y) position of the top-left corner of the rectangle and its width and height. We can construct a CGRect using the CGRectMake inline method, where the first two parameters passed to this method are the (x,y) positions and the next two are the width and height of the rectangle.

We expect the key to be a string so that we can compare it with the predefined keys that we have declared on top of our class, and if it matches, we will set the value of that property in our class. We will then use the NSObject method named valueForKey: to return the value associated with the given key. But obviously, before we do so, we ensure that the given key is one of the keys that we expect. In the setObject:forKeyedSubscript: method we do the exact opposite. We set the values for a given key instead of returning them.

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