NSTimer,UIActivityIndicatorView,UIProgressView等控件的使用方法

@synthesize _labelInfo; @synthesize _textInfo; @synthesize _buttonDownload; @synthesize _processViewDownload; @synthesize _activityIndicatorDownload; @synthesize _sliderDownload; @synthesize _switchDownload; @synthesize _timerDownload; - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. _imageBackground = [UIImage imageNamed:@"leaf.jpg"]; self.view.backgroundColor = [UIColor colorWithPatternImage:_imageBackground]; // 位置大小预设值 CGFloat x = self.view.frame.size.width / 8; CGFloat y = self.view.frame.size.height / 10; CGFloat w = x * 6; CGFloat h = 40; CGFloat hEdge = 10; CGFloat cornerRadius = 10; // 标签 _labelInfo = [[UILabel alloc] initWithFrame:CGRectMake(x, y, w, h)]; _labelInfo.text = @"绿豆猪下载"; _labelInfo.textColor = [UIColor greenColor]; _labelInfo.shadowColor = [UIColor redColor]; _labelInfo.shadowOffset = CGSizeMake(2, 3); _labelInfo.textAlignment = NSTextAlignmentCenter; NSArray* arrayFont = [UIFont familyNames]; _labelInfo.font = [UIFont fontWithName:arrayFont[arc4random()%arrayFont.count] size:h⑵]; [self.view addSubview:_labelInfo]; // 文本信息栏 y = _labelInfo.frame.origin.y + _labelInfo.frame.size.height; y += 2*hEdge; _textInfo = [[UITextField alloc] initWithFrame:CGRectMake(x, y, w, h)]; _textInfo.placeholder = @"Here is the app infomation list"; _textInfo.layer.cornerRadius = cornerRadius; _textInfo.backgroundColor = [UIColor whiteColor]; [self.view addSubview:_textInfo]; // 猪猪图标按钮 UIImage* imageStart = [UIImage imageNamed:@"pig.png"]; y = _textInfo.frame.origin.y + _labelInfo.frame.size.height; y += hEdge; _buttonDownload = [[UIButton alloc] initWithFrame:CGRectMake(x, y, w/4, h*2)]; [_buttonDownload setImage:imageStart forState:UIControlStateNormal]; _buttonDownload.backgroundColor = [UIColor clearColor]; [_buttonDownload addTarget:self action:@selector(onClickBtn:) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:_buttonDownload]; // 下载唆使器 _activityIndicatorDownload = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(x+w/2, y, w/4, h)]; //[_activityIndicatorDownload startAnimating]; [self.view addSubview:_activityIndicatorDownload]; // 下载开关 _switchDownload = [[UISwitch alloc] initWithFrame:CGRectMake(x+3*w/4, y, w/4, h)]; [_switchDownload addTarget:self action:@selector(onSwitchChange:) forControlEvents:UIControlEventValueChanged]; [self.view addSubview:_switchDownload]; // 下载进度条 _processViewDownload = [[UIProgressView alloc] initWithFrame:CGRectMake(x + w/4, y + h, 3*w/4, h)]; _processViewDownload.progress = 0; [self.view addSubview:_processViewDownload]; // 下载文件唆使器 y = _buttonDownload.frame.origin.y + _buttonDownload.frame.size.height; y += hEdge; _sliderDownload = [[UISlider alloc] initWithFrame:CGRectMake(x, y, w, h)]; [self.view addSubview:_sliderDownload]; } -(IBAction)onClickBtn:(id)sender { _textInfo.text = @"This is green pig app."; } -(IBAction)onSwitchChange:(id)sender { // 启动时显示进度控件，停止时隐藏控件 BOOL bHide = !_switchDownload.isOn; [_sliderDownload setHidden:bHide]; [_activityIndicatorDownload setHidden:bHide]; [_processViewDownload setHidden:bHide]; if(_switchDownload.isOn) { _sliderDownload.value = 0; _sliderDownload.minimumValue = 0; _sliderDownload.maximumValue = arc4random()%1000 + 10; _textInfo.text = @"strat download ....."; _timerDownload = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(onDownload) userInfo:nil repeats:YES]; [_activityIndicatorDownload startAnimating]; _processViewDownload.progress = 0; } else { [_timerDownload invalidate]; [_activityIndicatorDownload stopAnimating]; _textInfo.text = @"Download finished."; } } -(IBAction)onDownload { _processViewDownload.progress += arc4random()%100 / 1000.0f; _sliderDownload.value = _processViewDownload.progress * _sliderDownload.maximumValue; _textInfo.text = [NSString stringWithFormat:@"%.2f%% %.2fM %.2fM", _processViewDownload.progress*100, _sliderDownload.value, _sliderDownload.maximumValue]; if(_processViewDownload.progress >= 1) { [_switchDownload setOn:NO animated:YES]; [self onSwitchChange:_switchDownload]; } }