Storyboard 自定义转场动画

在storyboard中，segue有几种不同的类型，在iphone和ipad的开发中，segue的类型是不同的。在iphone中，segue 有：push，modal，和custom三种不同的类型，这些类型的区别在与新页面出现的方式。而在ipad中，有 push，modal，popover，replace和custom五种不同的类型。

1 自定义DetailStoryboardSegue类继承于UIStoryboardSegue

// 这个类用于处理跳转动画- (instancetype)initWithIdentifier:(NSString *)identifier source:(UIViewController *)source destination:(UIViewController *)destination{    self = [super initWithIdentifier:identifier source:source destination:destination];    if (self)    {    }    return self;}- (void)perform{// 如果使用系统的转场动画则不注释，如果使用自定义转场动画则重写该放法。//    [super perform];    // 自定义转成动画代码部分    UIViewController *source = self.sourceViewController;    UIViewController *destination = self.destinationViewController;    // Create a UIImage with the contents of the destination    UIGraphicsBeginImageContext(destination.view.bounds.size);    [destination.view.layer renderInContext:UIGraphicsGetCurrentContext()];    UIImage *destinationImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    // Add this image as a subview to the tab bar controller    UIImageView *destinationImageView = [[UIImageView alloc] initWithImage:destinationImage];    [source.parentViewController.view addSubview:destinationImageView];    // Scale the image down and rotate it 180 degrees (upside down)    CGAffineTransform scaleTransform = CGAffineTransformMakeScale(0.1, 0.1);    CGAffineTransform rotateTransform = CGAffineTransformMakeRotation(M_PI);    destinationImageView.transform = CGAffineTransformConcat(scaleTransform, rotateTransform);    // Move the image outside the visible area    CGPoint oldCenter = destinationImageView.center;    CGPoint newCenter = CGPointMake(oldCenter.x - destinationImageView.bounds.size.width, oldCenter.y);    destinationImageView.center = newCenter;    // Start the animation    [UIView animateWithDuration:0.5f                          delay:                        options:UIViewAnimationOptionCurveEaseOut                     animations:^(void) {                         destinationImageView.transform = CGAffineTransformIdentity;                         destinationImageView.center = oldCenter;                     }                     completion: ^(BOOL done) {                         // Remove the image as we no longer need it                         [destinationImageView removeFromSuperview];                         // Properly present the new screen                         [source.navigationController pushViewController:destination animated:nil];                     }];}