《精通iOS开发》第06章学习笔记

延迟加载处理

代码示例:

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- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.blueViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"Blue"];
[self.view insertSubview:self.blueViewController.view atIndex:0];
}

内存不足处理

代码示例:

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- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
if (!self.blueViewController.view.superview) {
self.blueViewController = nil;
} else {
self.yellowViewController = nil;
}
}

转换过程的动画效果

代码示例:

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- (IBAction)switchViews:(id)sender {
[UIView beginAnimations:@"View Flip" context:NULL];
[UIView setAnimationDuration:0.4];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
if (!self.yellowViewController.view.superview) {
if (!self.yellowViewController) {
self.yellowViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"Yellow"];
}
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.view cache:YES];
[self.blueViewController.view removeFromSuperview];
[self.view insertSubview:self.yellowViewController.view atIndex:0];
} else {
if (!self.blueViewController) {
self.blueViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"Blue"];
}
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.view cache:YES];
[self.yellowViewController.view removeFromSuperview];
[self.view insertSubview:self.blueViewController.view atIndex:0];
}
[UIView commitAnimations];
}
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