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Sounds, Images, and Text

Sounds, Images, and Text. FA 172 Intro to Mobile App Development. Agenda. Sounds System Sound Services Images Image View and the UIImage class Text Files, parsing, Web access. Sounds. Reference:

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Sounds, Images, and Text

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  1. Sounds, Images, and Text FA 172 Intro to Mobile App Development

  2. Agenda • Sounds • System Sound Services • Images • Image View and the UIImageclass • Text • Files, parsing, Web access

  3. Sounds • Reference: • http://www.raywenderlich.com/259/audio-101-for-iphone-developers-playing-audio-programmatically • Various ways to play sound, depending on format, length, and whether you want sounds played in the background • For this class, we will use System Sound Services via the AudioToolboxlibrary

  4. Setting up and playing sounds • Set up • Define sound id • SystemSoundId _soundId; • Specify sound file • NSString *file = [[NSBundlemainBundle] pathForResource: @"soundfile" ofType:@"wav"]; • NSURL *url =[NSURL fileURLWithPath:file]; • Associate with sound id • AudioServicesCreateSystemSoundID((CFURLRef) url, &_soundId); • Play • Play by indicating sound id • AudioServicesPlaySystemSound(_soundId);

  5. Sounds class • A Sounds class (Sounds.h, Sounds.m) has been provided that enables sound support • You are welcome to look at the implementation but do not need to as long as you understand how to invoke the methods • Class methods: • setSound: associate a sound file to an idNum (int) • play: plays the sound by indicating the idNum • Make sure to • Include AudioToolbox library in frameworks(Build Phases, Link Binary with Libraries) • Include sound files in “Supporting Files”

  6. Class methods revisited • Take note: the methods of the Sounds class are class methods • .h file (interface) contains method declarations with the + prefix • When using the class, [Sounds <method>]; • e.g.,[Sounds setSound: 3: @"file”: @"wav"];[Sounds play: 3];

  7. Images • Image View • Displays an image or animation (described by several images) • Placed within a UI View of a View Controller • Associated image can be assigned either • Through the Xcode environment: through attributes inspector • Or programmatically, by setting properties or calling methods on the UIImageView outlet connection

  8. UIImage • Set image of image view by assigning a UIImage object to the view’s image property self.imageView.image = [UIImageimageNamed:@"x.jpg"]; • Make sure all image files needed are included in the “Supporting Files” area (and added to the project’s target

  9. Animation • Set up an NSArray of images representing the images describing the animation • Set two properties of the view • animationImages: the NSArray • animationDuration: number representing the duration (in seconds) for one animation cycle • Call startAnimating method on the view • Call stopAnimating method to stop animation

  10. Animation Example NSArray *images = [NSArrayarrayWithObjects: [UIImageimageNamed:@"x.jpeg"], [UIImageimageNamed:@"y.jpeg"], [UIImageimageNamed:@"z.jpeg"], nil]; self.iv.animationImages = images; self.iv.animationDuration = 0.5; [self.ivstartAnimating];

  11. Exercise • Create a single view project with three buttons and one image view • Set the image of the view to some default image • Button 1: changes the image to the another image • Button 2: plays a sound • Button 3: plays a different sound and then runs an animation • The project requires 2 sounds and at least 4 images

  12. Text • Demonstrated through a sample project • Text files: read/write text (NSString*) from/to files • Parsing: from NSString to NSArray • Reading data from the web • To be posted on the website

  13. Summary • Sounds in an app can be played throughSystems Sound Services using the AudioToolbox library • Other frameworks are available • A Sounds class enabling sound support has been created for this course to simplify use • Images and animation supported through • UIImageView class • UIImage class

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