IOS小应用学习

此处代码来源于http://blog.sina.com.cn/iphonesdk

UIImageView图片自动切换

-(void)viewDidLoad{
// create the view that will execute our animation
UIImageView* campFireView = [[UIImageView alloc] initWithFrame:self.view.frame];
     
     // load all the frames of our animation
     campFireView.animationImages = [NSArray arrayWithObjects:   
                                 [UIImage imageNamed:@"campFire01.gif"],
                                 [UIImage imageNamed:@"campFire02.gif"],
                                 [UIImage imageNamed:@"campFire03.gif"], nil];
     
     // all frames will execute in 1.75 seconds
     campFireView.animationDuration = 1.75;
     // repeat the annimation forever
     campFireView.animationRepeatCount = 0;
     // start animating
     [campFireView startAnimating];
     // add the animation view to the main window
     [self.view addSubview:campFireView];
}

按钮打开URL地图

-(IBAction)openMaps{
     NSString* addressText = @"1 Queen st, Auckland, NZ";
    addressText = [addressText stringByAddingPercentEscapesUsingEncoding: NSASCIIStringEncoding];
    NSString* urlText = [NSString stringWithFormat:@"http://maps.google.com/maps?q=%@",addressText];
    //NSlog(urlText);
    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlText]];
}

 图片的持续移动

- (void)viewDidLoad
{
    //定义图片的位置和尺寸,位置:x=10.0f, y=10.0f ,尺寸:x=50.0f, y=40.0f
    UIImageView *subview = [[UIImageView alloc] initWithFrame:
                            CGRectMake(10.0f, 10.0f, 50.0f, 40.0f)];
    
    //设定图片名称,myPic.png已经存在，拖放添加图片文件到image项目文件夹中
    [subview setImage:[UIImage imageNamed:@"image2.jpg"]];
    
    //启用动画移动
    [UIImageView beginAnimations:nil context:NULL];
    
    //移动时间2秒
    [UIImageView setAnimationDuration:2];
    
    //图片持续移动
    [UIImageView setAnimationBeginsFromCurrentState:YES];
    
    //重新定义图片的位置和尺寸,位置
    subview.frame = CGRectMake(60.0, 100.0,200.0, 160.0);
    
    //完成动画移动
    [UIImageView commitAnimations];
    
    //在 View 中加入图片 subview
    [self.view addSubview:subview];
    
    //使用后释放图片, 使用iOS5,对像为iOS4.3以上可以忽略这步骤
    //[subview release];
}

加减法

int count = 0;
-(IBAction)reset{
    count = 0;
    counter.text = @"0";
    
}

- (IBAction)addUnit {
    
    if(count >= 999) return;
    
    NSString *numValue = [[NSString alloc] initWithFormat:@"%d", ++count];
    counter.text = numValue;
}

- (IBAction)subtractUnit {
    
    if(count <= 0) return;
    
    NSString *numValue = [[NSString alloc] initWithFormat:@"%d", --count];
    counter.text = numValue;
}