By Shawn Welch

There is “an app for that,” yet each app starts off as an idea. principles can come from anyone—designers or builders, advertising managers or CEOs—and this e-book is set bringing these principles to existence.

iOS is a outstanding platform, either from a expertise perspective and as a natural company chance. With over 10 billion apps downloaded during the iTunes App shop, and over 50 million new iOS units anticipated to send in 2011, no different platform places gigantic enterprise and person builders on a degree enjoying box like iOS does. keep in mind that, when you have an concept for an app, now's the time to make it happen.

Whether you’re a fashion designer or a developer, this ebook may help you:

  • Create easy person interface elements
  • Understand navigation metaphors and practices
  • Design for a number of devices
  • Customize procedure UI elements
  • Incorporate system-provided and customized animations
  • Use contact- and motion-based gestures
  • Create UIViews and UIViewControllers utilizing middle Graphics
  • Avoid rejection by way of the iTunes App shop

 

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Com/downloads/example#uilabel to obtain UILabelExample and all the venture records. during this code pattern, we organize a UILabel known as instance utilizing a body with a top of forty, a width of 320, and an foundation of (0,200) in our superview. We then set the label textual content to “Hello, international! ” in line three, and the textual content colour to white in line four. In strains five and six we manage a textual content drop shadow. For a one-pixel best shadow, we outline horizontal offset of zero, and a vertical offset of –1. ultimately in line 7 we heart the textual content in the bounds of the label via surroundings the textAlignment to UITextAlignmentCenter. as the label’s width is the width of the iPhone monitor, this facilities the textual content on the screen. realize in line eight that we set the historical past colour of the label. have in mind, as the UILabel is a subclass of UIView, the houses of the label are as well as the homes that exist already within the UIView. desk four. 1  UILabel houses and outlines 60 bankruptcy four uncomplicated person Interface items An instance of a UILabel Tip via default, a UILabel is opaque with a historical past colour of white. which means each pixel within the label’s rectangle has to be crammed. to place the textual content on most sensible of a history (e. g. , textual content on a clear historical past or over an image), set instance. opaque to NO; and instance. backgroundColor to [UIColor clearColor]. UIImage and UIImageView photographs might be strong instruments in iOS apps. The UIImage is a subclass of NSObject, and a part of the root framework. an easy item, the UIImage represents the knowledge had to reveal a picture. The UIImage counterpart in UIKit is the UIImageView. UIImageView is a subclass of UIView, however it is designed for the aim of drawing UIImages to the display. A UIImage helps the next codecs: seventy seven photograph Interchange layout (. gif) seventy seven Joint Photographic specialists crew (. jpg, . jpeg) seventy seven transportable community image (. png) seventy seven Tagged picture dossier structure (. tiff, . tif) seventy seven home windows Bitmap structure (. bmp, . BMPf) UIKit seventy seven home windows Icon structure (. ico) seventy seven home windows Cursor (. cur) seventy seven XWindow Bitmap (. xbm) Tip To optimize your apps, think about using PNG records with a clear history. iOS honors the transparency in PNGs, providing you with the facility to regulate heritage shades with a picture overlay whereas desiring just one photograph asset. whilst making a UIImageView, you will have the choice of initializing the view with the traditional view initialization technique, initWithFrame. in spite of the fact that, as a result of the detailed nature of pictures, iOS promises an extra initialization process, initWithImage. if you happen to initialize a UIImageView with a picture, it immediately units the peak and width of the UIImageView to the peak and width of the UIImage. 1 UIImage *myImage = [UIImage imageNamed:@"sample. png"]; 2 UIImageView *myImageView = [[UIImageView alloc] initWithImage:myImage]; three [self. view addSubview:myImageView]; In line 1, we create a UIImage from our pattern photo, pattern. png. This UIImage isn't a picture that may be exhibited to the person; it's truly only a info sort used to shop the picture info, just like a string, array, or dictionary.

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