ios学习笔记——简单控件（动态指示标识、进度条）

来源：互联网发布：121b数据编辑：程序博客网时间：2024/05/13 10:11

1.动态指示标识（ActivityIndicatorView）

在.h文件中添加一下代码：

@property (retain, nonatomic) UIProgressView *pProgress;@property (retain, nonatomic) UILabel *pProgressValueLabel;@property (assign, nonatomic) float progressValue;

在.m文件中实现方法：

- (void)addActivityIndicatorView:(id)sender{    //创建初始化ActivityIndicatorView(Style)    self.pActivity = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];    //设置pActivity的位置    [self.pActivity setFrame:CGRectMake(10, 280, 45, 45)];    //设置是否隐藏    self.pActivity.hidden = NO;    //把pActivity添加到当前视图中    [self.view addSubview:self.pActivity];    //创建按钮，关联对应方法    UIButton *pBtton = [UIButton buttonWithType:UIButtonTypeRoundedRect];    [pBtton setFrame:CGRectMake(10, 330, 45,30 )];    [pBtton setTitle:@"转" forState:UIControlStateNormal];    //给按钮关联方法，实现pActivity在不同状态下的动作    [pBtton addTarget:self action:@selector(doRotate:) forControlEvents:UIControlEventTouchUpInside];    //为按钮创建标签，唯一标记，可再次找到    pBtton.tag = 110;    [self.view addSubview:pBtton];    //把创建的对象释放    [pBtton release];}

//为按钮设置的方法，改变指示标识的运行状态- (void)doRotate:(id)sender{    UIButton *pBtton = (UIButton *)sender;    //判断Activity是否运行来设置其运行状态    [self.pActivity isAnimating]?[self.pActivity stopAnimating]:[self.pActivity startAnimating];    //根据Activity是否运行来设置按钮的title    [pBtton setTitle:(self.pActivity.isAnimating?@"停":@"转")forState:UIControlStateNormal];    //设置是否隐藏    self.pActivity.hidden = NO;}

生成的标识如下图：

2.进度条（Progress）

- (void)addProgress:(id)sender{    //创建进度条并初始化    self.pProgress = [[UIProgressView alloc]initWithFrame:CGRectMake(10, 360, 300, 30)];    //设置Style    self.pProgress.progressViewStyle = UIProgressViewStyleBar;    //分别设置进度条完成未完成的颜色    self.pProgress.trackTintColor = [UIColor redColor];    self.pProgress.progressTintColor = [UIColor greenColor];    //把进度条添加到当前的视图中    [self.view addSubview:self.pProgress];    //创建用来显示进度的label    self.pProgressValueLabel = [[UILabel alloc]initWithFrame:CGRectMake(100, 370, 110, 30)];    self.pProgressValueLabel.backgroundColor = [UIColor clearColor];    self.pProgressValueLabel.text = [NSString stringWithFormat:@"加载:%.1f%%",self.progressValue*100];    [self.view addSubview:self.pProgressValueLabel];    //通过计时器完成循环调用    pTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(progressMethod:) userInfo:nil repeats:YES];}

在.h文件中添加NSTimer * pTimer 成员

//计时器的实现方法- (void)progressMethod:(id)sender{    //进度条每次进行的变化    self.progressValue += 0.1;    self.pProgress.progress = self.progressValue;    //把进度条当前的进度显示    self.pProgressValueLabel.text = [NSString stringWithFormat:@"加载:%.1f%%",self.progressValue*100];    //判断进度条是否以完成    if (self.progressValue >= 1)    {        self.progressValue = 0;        //设置标签的名字        self.pProgressValueLabel.text = @"加载完成";        //停止计时器        [pTimer invalidate];    }}

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