UIProgressView-初识IOS

好几天没更新了，学的时候太紧，没时间复习了都。今天刚好有时间，多更几个。

今天复习的是UIProgressView,我们常见使用在修改某些属性的时候经常用到，比如透明度，今天我们介绍一个简单的使用例子

定义什么的，我就不多说了。前边已经介绍很多了。

    //声明一个进度条视图    
    _progressview = [[UIProgressView alloc]initWithProgressViewStyle:UIProgressViewStyleDefault];
      //设置进度条的显示位置
    [_progressview setFrame:CGRectMake(10, 550, [UIScreen mainScreen].bounds.size.width - 20, 5)];
      //设置进度条走过的颜色
    [_progressview setProgressTintColor:[UIColor redColor]];
    //设置进度条没走过的颜色
    [_progressview setTrackTintColor:[UIColor greenColor]];
    //设置进度条初始值
    [_progressview setProgress:0.5 animated:YES];

然后我们来设置一个全局变量，来承接进度条的值，这里要注意 ，进度条的范围是0 － 1，所以一般都取0.5f 为中间值。

记得 定义完之后一定要加载视图，到现在了我也经常忘记加载

[self.view addSubview:_progressview];

我定义了三个按钮，"＋"，"－"，"测试",并给他定义了方法。

    UIButton *add = [UIButton buttonWithType:UIButtonTypeCustom];
    [add setTitle:@"增加" forState:UIControlStateNormal];
    [add setFrame:CGRectMake(160, 100, 80, 30)];
    [add setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
    [add setBackgroundColor:[UIColor greenColor]];
    [add.titleLabel setFont:[UIFont systemFontOfSize:20]];
    [add addTarget:self action:@selector(jia) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:add];
    

    
    UIButton *smal = [UIButton buttonWithType:UIButtonTypeCustom];
    [smal setTitle:@"减小" forState:UIControlStateNormal];
    [smal setFrame:CGRectMake(160, 260, 80, 30)];
    [smal setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
    [smal setBackgroundColor:[UIColor greenColor]];
    [smal.titleLabel setFont:[UIFont systemFontOfSize:20]];
    [smal addTarget:self action:@selector(Smal) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:smal];
    
    UIButton *ceshi = [UIButton buttonWithType:UIButtonTypeCustom];
    [ceshi setTitle:@"测试" forState:UIControlStateNormal];
    [ceshi setFrame:CGRectMake(160, 420, 80, 30)];
    [ceshi setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
    [ceshi setBackgroundColor:[UIColor greenColor]];
    [ceshi.titleLabel setFont:[UIFont systemFontOfSize:20]];
    [self.view addSubview:ceshi];
    
    
    [ceshi addTarget:self action:@selector(Aabb) forControlEvents:UIControlEventTouchUpInside];

相关方法

-(void)jia{
    self.f = self.f+0.1;
    if (self.f <= 1) {
        _progressview.progress = _f;
    }else{
        _f = 1.0;
        _progressview.progress = _f;
    }
}
- (void)Add{
    self.f=self.f+0.1;
    if (self.f <= 1) {
        _progressview.progress = _f;
    }else{
        _f = 1.0;
        _progressview.progress = _f;
    }
    
}
-(void)Smal{
    _f = _f-0.1;
    if (_f >=0) {
        _progressview.progress = _f;
    } else {
        _f = 0;
        _progressview.progress = _f;
    }
}
-(void)Aabb{
    NSLog(@"mmmmmmmm");
}

出现的效果就是随着点击按钮，f值就会随着改变，进度条的值也会明显的改变。

总的来说UIProgressView也没什么说的，基本上常用到的就这一点，根据进度条的值改变某些东西的属性值。