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];

button

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");
}