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！
