How to resize a UIModalPresentationFormSheet?

问题

I am trying to display a modal view controller as a UIPresentationFormSheet. The view appears, but I can't seem to resize it. My XIB has the proper height & width, but it seems to get overridden when I call it like this:

composeTweetController = [[ComposeTweet alloc] initWithNibName:@"ComposeTweet" bundle:nil];
composeTweetController.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentModalViewController:composeTweetController animated:TRUE];

Any thoughts? I am using the iPhone SDK 3.2 beta 4

回答1:

You are able to adjust the frame of a modal view after presenting it:

Tested in iOS 5.1 - 7.1

MyModalViewController *targetController = [[[MyModalViewController alloc] init] autorelease];
targetController.modalPresentationStyle = UIModalPresentationFormSheet;
targetController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;  //transition shouldn't matter
[self presentViewController:targetController animated:YES completion:nil];

if(floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_6_1){
     targetController.view.superview.frame = CGRectInset(targetController.view.superview.frame, 100, 50);
}else{
     targetController.view.frame = CGRectInset(targetController.view.frame, 100, 50);
     targetController.view.superview.backgroundColor = [UIColor clearColor];
}

回答2:

Here's a method that works on iOS7 as well as iOS5 and iOS6: (arc)

-(void)presentController:(UIViewController*)controller fromRootController:(UIViewController*)rootController withSize:(CGSize)size
{
    UINavigationController* nav = [[UINavigationController alloc] initWithRootViewController:controller];
    nav.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
    nav.modalPresentationStyle = UIModalPresentationFormSheet;
    [rootController presentModalViewController:nav animated:YES];
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)
    {
        nav.view.superview.backgroundColor = [UIColor clearColor];
        nav.view.bounds = CGRectMake(0, 0, size.width, size.height);
    }
    else
    {
        nav.view.superview.bounds = CGRectMake(0, 0, size.width, size.height);
    }
}

回答3:

composeTweetController = [[ComposeTweet alloc] initWithNibName:@"ComposeTweet" bundle:nil];
composeTweetController.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentModalViewController:composeTweetController animated:TRUE];
//if you want to change its size but the view will remain centerd on the screen in both portrait and landscape then:
composeTweetViewController.view.superview.bounds = CGRectMake(0, 0, 320, 480);
//or if you want to change it's position also, then:
composeTweetViewController.view.superview.frame = CGRectMake(0, 0, 320, 480);

回答4:

As of iOS7 you can simply do

composeTweetController.preferredContentSize = CGSizeMake(380.0, 550.0);

回答5:

Tested and works for iOS 6, using XCode 4.5

I stumbled upon my answer after reading much of the tips on here:

In the viewWillAppear:(BOOL)animated method:

[super viewWillAppear:animated];

 //resize modal view
 self.view.superview.bounds = CGRectMake(0, 0, 432, 680);

In the viewDidAppear:(BOOL)animated method:

CGPoint centerPoint = CGPointMake([[UIScreen mainScreen] bounds].size.width/2, [[UIScreen mainScreen] bounds].size.height/2);
self.view.superview.center = centerPoint;

I tried to add the centering code in the same place as the resizing code, but that did not work. For some reason, it only works after the view has appeared on the screen.

I surmise that it has something to do with the way that UIModalPresentationFormSheet works, because when I was stepping through in the LLDB debugger, I noticed that there was a variable _formSheetSize that was still {540, 620}. Go figure.

回答6:

This will work with any UIModalTransitionStyle

@interface BaseDialog ()

@property(nonatomic,assign) CGRect origFrame;

@end

@implementation BaseDialog

-(void)viewDidLoad{
    [super viewDidLoad];
    self.origFrame=self.view.frame;
}
-(CGSize)formSheetSize{
    return self.origFrame.size;
}

回答7:

Following first code is how to present your model view controller

 composeTweetController = [[ComposeTweet alloc] initWithNibName:@"ComposeTweet" bundle:nil];
    composeTweetController.modalPresentationStyle = UIModalPresentationFormSheet;
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:composeTweetController];
    navigationController.delegate = self;   
    [self presentModalViewController:navigationController animated:YES];

And In your ComposeTweet controller class

-(void)viewWillAppear:(BOOL)animated
{
 [super viewWillAppear:animated];
 self.navigationController.view.superview.frame = CGRectMake(0, 0,500,400);
}

回答8:

iOS 7

So the approach of setting the superview's frame or bounds doesn't work anymore on iOS 7 (for UIModalTransitionStyleCoverVertical). You can, however, now set the background color of the superview to clear and then change the frame of the modal view controller how you see fit.

So in iOS 7 you will want to:

present the view controller (presentation mode: UIModalPresentationFormSheet)
set view controller superview background color to clear
change frame of view controller as desired (perhaps making it smaller and then centering it in superview)

回答9:

I got a full screen modal view from UIPresentationFormSheet with just this line:

modalViewController.view.superview.bounds = CGRectMake(0, 0, 1024, 748);

回答10:

@bdrobert sadly your nice solution does not work anymore on iOS6 - the container keeps the original size even though the new viewcontroller is embedded with the custom size.

You probably need to use the containment API introduced in iOS5, but you need to add a dimmed background on your own, fetching all touch events for that area.

回答11:

On change of orientation, this code work perfect....

settingViewController.modalPresentationStyle = UIModalPresentationFormSheet;

    [self presentViewController:settingViewController animated:YES completion:nil];

    settingViewController.view.superview.frame = CGRectMake(0, 0, 700, 700);

    UIInterfaceOrientation currentOrientation = [self getDeviceOrientation];

    if(currentOrientation == UIInterfaceOrientationPortrait || currentOrientation == UIInterfaceOrientationPortraitUpsideDown)
    {
            CGPoint centerPoint = CGPointMake([[UIScreen mainScreen] bounds].size.width/2, [[UIScreen mainScreen] bounds].size.height/2);
            settingViewController.view.superview.center = centerPoint;
    }
    else
    {
        CGPoint centerPoint = CGPointMake([[UIScreen mainScreen] bounds].size.height/2, [[UIScreen mainScreen] bounds].size.width/2);
        settingViewController.view.superview.center = centerPoint;
    }