NSScreencast Episode #10 Fun with Blocks

Fun with Blocks - NSScreencast

• block From iOS SDK 4.0
• UIImageVIew
  • frame = self.view.bounds
  • contentMode, UIViewContentModeScaleAspectFit
  • addSubview
  • UIActivityIndicatorView
    • hideWhenStopped = YES
    • center
    • addSubview
• load resource
  • startAnimating
  • stopAnimating
  • dispatch_async(dispatch_get_global_queue
    • DISPATCH_QUEUE_PRIORITY_BACKGROUND
    • ^ { .. }
    • dispatch_async(dispatch_get_main_queue [_indicator stopAnimating]
• UITapGestureRecognizer
  • action@selector(method)
• completionBlock:(void (^)(UIImage *))completionBlock
  • completionBlock:^(UIImage *image)
• NSStringFromCGSize
• resizeImage
  • dispatch_async(dispatch_get_global_queue
  • CGSizeMake
  • UIGraphicsBeginImageContent(newSize)
  • [image drawInRect
  • UIGraphicsGetImageFromCurrentImageContext
  • UIGraphicsEndImageContext()
  • completion(obj)
• typedef void (^ImageCompletionBlock)(UIImage *)
  • typedef void (^Actionblock)()
• UIAnimations
  • UIView animateWithDuration:0.5 animations:^{
    • fade alpha = 1, 0
  • CGAffineTransformMakeScale
• bounceImage
  • scale 1.1 -> 0.9 -> 1.0