最近短信服务商要求公司的app在获取短信验证码时加上校验码，目前比较流行的是采用类似滑动解锁的方式，我们公司采取的就是这种方式，设计图如下所示：

这里校验内部的处理逻辑不作介绍，主要分享一下界面效果的实现, 下面贴出代码：

先子类化UISlider

#import <UIKit/UIKit.h> #define SliderWidth 240 #define SliderHeight 40 #define SliderLabelTextColor [UIColor colorWithRed:193/255.0 green:193/255.0 blue:193/255.0 alpha:1] #define SliderLabelBorderColor [UIColor colorWithRed:193/255.0 green:193/255.0 blue:193/255.0 alpha:1].CGColor #define SliderMinimumTrackTintColor [UIColor redColor] #define SliderLabelFont 14 #define SliderLabelText @"滑动解锁/获取验证码" #define ThumbImageWidth 40 #define ThumbImageHeight 40 @interface CheckCodeSlider : UISlider @end //******************************************************* #import "CheckCodeSlider.h" @implementation CheckCodeSlider //覆写父类UISlider的方法改变滑条frame - (CGRect)trackRectForBounds:(CGRect)bounds{ return CGRectMake(0, 0, SliderWidth, SliderHeight); } @end 再实例化CheckCodeSlider，这里随便在一个ViewController里写的 #import "ViewController.h" #import "CheckCodeSlider.h" @interface ViewController (){ UIImageView *imgView; } @property (nonatomic ,strong)CheckCodeSlider *slider; @property (nonatomic ,strong)UILabel *label; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor whiteColor]; [self createSlider]; } - (void)createSlider{ _slider = [[CheckCodeSlider alloc]initWithFrame:CGRectMake(0, 0, SliderWidth, SliderHeight)]; _slider.center = self.view.center; _slider.minimumTrackTintColor = [UIColor clearColor]; _slider.maximumTrackTintColor = [UIColor clearColor]; _slider.layer.masksToBounds = YES; _slider.layer.cornerRadius = SliderHeight/2; [_slider setThumbImage:[UIImage imageNamed:@"滑块按钮"] forState:UIControlStateNormal]; [_slider addTarget:self action:@selector(sliderValueChanged:) forControlEvents:UIControlEventValueChanged]; [self.view addSubview:_slider]; _label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, SliderWidth, SliderHeight)]; _label.center = self.view.center; _label.text = SliderLabelText; _label.font = [UIFont systemFontOfSize:SliderLabelFont]; _label.textAlignment = NSTextAlignmentCenter; _label.textColor = SliderLabelTextColor; _label.layer.masksToBounds = YES; _label.layer.cornerRadius = SliderHeight/2; _label.layer.borderWidth = 1; _label.layer.borderColor = SliderLabelBorderColor; [self.view addSubview:_label]; //这里创建了一个跟滑块相同的imageview覆盖在文字上面，并在sliderValueChanged方法中让其跟着滑块滑动。 imgView = [[UIImageView alloc]initWithFrame:CGRectMake(_slider.frame.origin.x-2, _slider.frame.origin.y-2, ThumbImageWidth+4, ThumbImageHeight+4)]; imgView.image = [UIImage imageNamed:@"滑块按钮"]; [self.view addSubview:imgView]; } - (void)sliderValueChanged:(UISlider *)slider{ [_slider setValue:slider.value animated:NO]; if (slider.value >0) { _slider.minimumTrackTintColor = SliderMinimumTrackTintColor; }else{ _slider.minimumTrackTintColor = [UIColor clearColor]; } imgView.center = CGPointMake(_slider.frame.origin.x+slider.value*(SliderWidth-ThumbImageWidth)+ThumbImageWidth/2, _slider.frame.origin.y+ThumbImageHeight/2); if (!slider.isTracking && slider.value != 1) { [_slider setValue:0 animated:YES]; if (slider.value >0) { _slider.minimumTrackTintColor = SliderMinimumTrackTintColor; }else{ _slider.minimumTrackTintColor = [UIColor clearColor]; } imgView.frame = CGRectMake(_slider.frame.origin.x-2, _slider.frame.origin.y-2, ThumbImageWidth+4, ThumbImageHeight+4); } }

这样就可以实现上图中的效果，只需要在sliderValueChanged根据slider的value值做相应处理就行了。

以上所述是小编给大家介绍的iOS滑动解锁、滑动获取验证码效果的实现代码，希望对大家有所帮助！