小编P.J*_*iya的帖子

我无法播放mp3音频文件.

URL_PATH = @"http://...../.…./A1.mp3";

NSError*错误;

player = [[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL URLWithString:URL_PATH] error:&error];
if (error) 
{
    NSLog(@"error:%@",error.localizedDescription);
}

if (player ==nil)
{
    NSLog(@"nil");
}
else 
{
    NSLog(@"playing");
    [player play];
}  

错误代码 :

error:The operation couldn’t be completed. (OSStatus error -43.)
nil

我能怎么做？请告诉我提示.预先感谢!

我创建了一个Constants.h文件,其中包含以下列表:

#define kw00 @"foo" 
#define kw01 @"bar"
...

我也在Constants.h.h中使用#import .使用newQuote方法,我想随机选择的一个kw strings,但我有困难,探索如何call a reference以一个constant是字符串中定义kwString.

-(IBAction)newQuote 
{
    int rNumber = arc4random() % kwTotal;
    (rNumber <9) 
    {
        NSString *kwString = [@"kw0" stringByAppendingString:[NSString stringWithFormat:@"%d", rNumber]];   
    }
}

我们非常感谢您的想法和建议.

我有两个viewControllers访问NSNumber的AppDelegate.其中一个人可以看到它,而另一个则不能.我对这完全感到困惑.

有问题的那个有这个代码.

AppDelegate *dataStore = (AppDelegate *)[[UIApplication sharedApplication] delegate];
dataStore.downHUD = [NSNumber numberWithFloat:(float)progress];

另一个有这个.

AppDelegate *dataStore = (AppDelegate *)[[UIApplication sharedApplication] delegate];
dataStore.downHUD = [NSNumber numberWithFloat:(float)0];

两者都在.m文件中导入AppDelegate,但我最终得到了

在'AppDelegate*'类型的对象上找不到属性'downHUD'

与第一个.谁能帮我看看有什么不对？

我错误地复制并粘贴了很多代码AppDelegate,这已得到纠正.是否有某种链接可能被破坏？

用手指移动和旋转图像

- (void)viewDidLoad
{
    self.imageview.image = [UIImage imageNamed:@"Image.png"];
    [self.view addSubview: self.imageview];
    [super viewDidLoad];
}

此代码用于移动图像

-(void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event
{
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLocation = [touch locationInView:touch.view];
    self.imageview.center = touchLocation;
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    // get touch event

    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLocation = [touch locationInView:self.PlayVideo];

    if ([touch view] == self.view)
    {

        self.imageview.center = touchLocation;


    }
}

此代码用于旋转图像(T将旋转手势放到图像上并拖到.h文件中)

- (IBAction)regRotation:(UIGestureRecognizer *)sender 
{
    NSLog(@"rotation");
    CGFloat netRotation =0.0;
    CGFloat rotation =[(UIRotationGestureRecognizer *)sender rotation];
    CGAffineTransform …

海IAM新的objective c和iOS发展

设置UIImageview图像.尝试以下代码

arrowImgVw is UIImageView Class object

UIImage *image=[[UIImage alloc]init];
image=[UIImage imageNamed:@"return_journey_denoter.png"];
arrowImgVw.image = image;