Question

我以编程方式创建视图，UI元素等。我正在尝试在添加或删除视图时为其添加动画效果。问题是只有UIButton *按钮被动画并且动画错误。我的意思是按钮标题来自顶部，按钮本身来自屏幕右侧。

请参阅以下代码

AppDelegate.h

#import <UIKit/UIKit.h>
#import "TViewController.h"
@interface AppDelegate : UIResponder <UIApplicationDelegate>
{
    TViewController *tv;
}

@property (strong, nonatomic) TViewController *tv;
@property (strong, nonatomic) UIWindow *window;

@end

AppDelegate.m .....

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    self.window.backgroundColor = [UIColor whiteColor];
    self.tv = [[TViewController alloc]initWithNibName:@"TViewController" bundle:nil];
    self.window.rootViewController = self.tv;

    [self.window makeKeyAndVisible];
    return YES;
}

TViewController.h

#import <UIKit/UIKit.h>
#import "Elements.h"
@interface TViewController : UIViewController
{
    Elements *el;
}

@property (nonatomic, retain) Elements *el;
@end

TViewController.m

-(void)loadView
{
    self.view = [[UIView alloc]initWithFrame:[UIScreen mainScreen].applicationFrame];

    self.el = [[Elements alloc] 
               initWithNibName:@"Elements" 
               bundle:nil];

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:3.0];
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.view.superview cache:YES];
    [self.view addSubview:self.el.view];
    self.view.backgroundColor = [UIColor grayColor];
    [self.view removeFromSuperview];
    [UIView commitAnimations];

}

Elements.m

self.view = [[UIView alloc]initWithFrame:[UIScreen mainScreen].applicationFrame];

    UILabel *howManyUsersLabel = [[UILabel alloc]initWithFrame:CGRectMake(10, 20, 300, 150)];
    howManyUsersLabel.text = @"Label ...";
    [self.view addSubview:howManyUsersLabel];


    UIPickerView *playersPickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(10, 150, 250, 100)];
    playersPickerView.delegate = self;
    playersPickerView.showsSelectionIndicator = YES;
    [self.view addSubview:playersPickerView];


    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame = CGRectMake(20, 370, 280, 50);
    [button setTitle:@"Button" forState:UIControlStateNormal];

    [self.view addSubview:button];

Answer 1

转换必须应用于在转换期间不会被删除或添加的视图。您正在向self.view添加转换，但之后您将在转换期间删除self.view。

尝试将转换添加到self.view.superview，如下所示：

[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.view.superview cache:YES];

如果仍然无效，您确定此代码是否正确：

[self.view addSubview:self.el.view];
self.view.backgroundColor = [UIColor grayColor];
[self.view removeFromSuperview];

字面上，这段代码说：

add self.el.view as a subview to self.view
set background colour of self.view to gray
remove self.view from the screen

这意味着前两行毫无意义，因为当您从屏幕上移除视图时，您对视图所做的一切都将被消除。在loadView期间删除视图是一件奇怪的事情 - 最终结果是加载后视图将为零。

切换视图期间的奇怪动画

1 个答案: