iphone相关的闪屏

Posted 2023-03-16

【中文标题】iphone相关的闪屏

【英文标题】：Splash screen related in iphone

【发布时间】：2011-05-12 09:23:30

【问题描述】：

您好，我正在尝试借助计时器来启动屏幕。但它不能。是否有关于此代码的任何建议.........

SplashViewController.h:-

#import <UIKit/UIKit.h>
#import "MainMenu.h"

@interface SplashViewController : UIViewController 
    UIImage *imgSplash;
    NSTimer *timer;
    MainMenu *objMainMenuView;


@property (nonatomic,retain) NSTimer *timer;
@property (nonatomic,retain) UIImage *imgSplash;
@property (nonatomic,retain) MainMenu *objMainMenuView;



@end

SplashViewController.m:-

#import "SplashViewController.h"


@implementation SplashViewController
@synthesize timer,imgSplash,objMainMenuView;

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad 
    [super viewDidLoad];

    timer = [[NSTimer alloc] init]; 

    UIImageView *splashImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0,0,320,460)];
    imgSplash = [[UIImage alloc] init];
    imgSplash = [UIImage imageNamed:@"chicocredit_splash.png"];
    [splashImageView setImage:imgSplash];

    [self.view addSubview:splashImageView];

    timer = [NSTimer timerWithTimeInterval:2.0 target:self.timer selector:@selector(fadeScreen) userInfo:nil repeats:NO];
    if([timer isValid]==1)
           
        [timer fire];
        //self.view.alpha = 0.0;

        objMainMenuView = [[MainMenu alloc] initWithNibName:@"MainMenu" bundle:nil];
        [self.navigationController pushViewController:objMainMenuView animated:YES];
       


-(void) onTimer
    NSLog(@"LOAD");


- (void)fadeScreen



    [UIImageView beginAnimations:nil context:nil]; 
    [UIImageView setAnimationDuration:2.0];       
    [UIImageView setAnimationDelegate:self];
    [UIImageView commitAnimations];

    //[UIView setAnimationDidStopSelector:@selector(finishedFading)];  

    //self.view.alpha = 0.0;       
    //[UIView commitAnimations];   


/*
- (void) finishedFading
   
    [UIView beginAnimations:nil context:nil]; 
    [UIView setAnimationDuration:5.0];

    //self.view.alpha = 1.0;   
    //viewController.view.alpha = 1.0;
    //self.objMainMenuView.view.alpha = 1.0;

    [UIView commitAnimations];   
    //[splashImageView removeFromSuperview];
*/




- (void)dealloc 
    [super dealloc];



@end

【问题讨论】：

你只有一张图片，所以没有必要拍摄动画，所以只需使用时间延迟我把你的解决方案放在下面

【参考方案1】：

使用这个它可能是解决方案。

- (void)viewDidLoad 

timer = [[NSTimer alloc] init]; 


CGRect myImageRect = CGRectMake(0.0f, 0.0f, 320.0f, 460.0f);
splashImageView = [[UIImageView alloc] initWithFrame:myImageRect]; 
[splashImageView setImage:[UIImage imageNamed:@"image3.jpg"]];
splashImageView.opaque = YES; 
[self.view addSubview:splashImageView];
[splashImageView release]; 

[self performSelector:@selector(doTHis) withObject:nil afterDelay:2.0];
[super viewDidLoad];

-(void)doTHis
objMainMenuView = [[MainMenu alloc] initWithNibName:@"MainMenu" bundle:nil];
[self.navigationController pushViewController:objMainMenuView animated:YES];

祝你好运

【参考方案2】：

看起来你的 MianMenu 在你看到淡入淡出效果之前就被推送了。这是因为您正在触发计时器并立即按下主菜单。

// 在这里安排计时器。

[NSTimer timerWithTimeInterval:2.0f target:self selector:@selector(timerFireMethod:) userInfo:nil repeats:NO];

// 定时器触发方法。

-(void) timerFireMethod:(NSTimer *) theTimer 
[UIView beginAnimations:nil context: nil];
[UIView setAnimationDuration:2.0f];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector: @selector(animationDidStop: finished: context:)];

// Put animation code.

[UIView commitAnimations];

// 动画结束时调用。

-(void) animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context 
// Called when animation finishes.
// Push the Main menu here.

在计时器触发方法中保留断点。它应该在指定的 2 秒后被调用。 然后在 animationDidStopSelector 方法中保留断点。它会在 2 秒的淡入淡出动画后被调用。

【讨论】：

Thanx，但我试过还是不行，请给我一些建议。

你能告诉我们行为吗？它会褪色吗？它会在不褪色的情况下推送到主菜单吗？马上？

【参考方案3】：

你的代码泄露了：

1：

timer = [[NSTimer alloc] init]; //Leak here, remove this line
.
.
.
timer = [NSTimer timerWithTimeInterval:2.0 target:self.timer selector:@selector(fadeScreen) userInfo:nil repeats:NO];

2：

imgSplash = [[UIImage alloc] init];//Leak here, remove this line
imgSplash = [UIImage imageNamed:@"chicocredit_splash.png"];

3：

   UIImageView *splashImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0,0,320,460)];
    ...
    [splashImageView setImage:imgSplash]; //Leak here, should release splashImageView

【参考方案4】：

为什么不呢，在计时器到期并完成淡入淡出之后执行其他所有操作。

- (void) finishedFading
   
        objMainMenuView = [[MainMenu alloc] initWithNibName:@"MainMenu" bundle:nil];
        [self.navigationController pushViewController:objMainMenuView animated:YES];

【参考方案5】：

捷径：使用另一个带有 imageView 的 viewController 以模态方式呈现它并通过动画溶解关闭。 您应该在 viewWillAppear 中显示视图。在第二个 viewController 的 viewLoad 上启动计时器。当计时器触发时将其关闭。