iOS自定义水平滚动条、进度条，继承UIView，可点击轨道、滑动滑块交互。
先看一下效果图：
简单说一下逻辑，新建一个继承UIView的类，分别给轨道、滑块添加UITapGestureRecognizer点击、UIPanGestureRecognizer滑动手势。获取偏移量，计算控件位置，刷新视图。
下面贴上核心代码：
显示视图，在控制器调用代码：
HWSlider *slider = [[HWSlider alloc] initWithFrame:CGRectMake(10, 50, 300, 75)];[self.view addSubview:slider];
HWSlider：
#import <UIKit/UIKit.h>@interface HWSlider : UIView@property (nonatomic, assign) NSInteger score;@end/*** ---------------分割线--------------- ***/#import "HWSlider.h"#import "UIView+Additions.h"@interface HWSlider ()@property (nonatomic, weak) UIImageView *bubbleImage;@property (nonatomic, weak) UIImageView *arrowImage;@property (nonatomic, weak) UILabel *scoreLabel;@property (nonatomic, weak) UILabel *levelLable;@property (nonatomic, weak) UIView *trackView;@property (nonatomic, weak) UIImageView *thumb;@end@implementation HWSlider- (instancetype)initWithFrame:(CGRect)frame{ if (self = [super initWithFrame:frame]) { _score = 10; self.backgroundColor = [UIColor whiteColor]; //气泡图片 UIImageView *bubbleImage = [[UIImageView alloc] initWithFrame:CGRectMake(self.bounds.size.width - 70, 0, 74, 35)]; [bubbleImage setImage:[UIImage imageNamed:@"alert_teacherEva_bubbleImage"]]; [self addSubview:bubbleImage]; _bubbleImage = bubbleImage; //分数标签 UILabel *scoreLabel = [[UILabel alloc] initWithFrame:CGRectMake(self.bounds.size.width - 71.5, 0, 74, 28)]; scoreLabel.text = @"10"; scoreLabel.textColor = [UIColor blackColor]; scoreLabel.font = [UIFont systemFontOfSize:15.f]; scoreLabel.textAlignment = NSTextAlignmentCenter; [self addSubview:scoreLabel]; _scoreLabel = scoreLabel; //气泡箭头 UIImageView *arrowImage = [[UIImageView alloc] initWithFrame:CGRectMake(self.bounds.size.width - 16.5, 26, 13, 13)]; [arrowImage setImage:[UIImage imageNamed:@"alert_teacherEva_arrowImage"]]; [self addSubview:arrowImage]; _arrowImage = arrowImage; //轨道可点击视图（轨道只设置了5pt，通过这个视图增加以下点击区域） UIView *tapView = [[UIView alloc] initWithFrame:CGRectMake(0, 34, self.bounds.size.width, 20)]; [tapView addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)]]; [self addSubview:tapView]; //轨道背景 UIView *backView = [[UIView alloc] initWithFrame:CGRectMake(0, 7.5, self.bounds.size.width, 5)]; backView.backgroundColor = [UIColor grayColor]; backView.layer.cornerRadius = 2.5f; backView.layer.masksToBounds = YES; [tapView addSubview:backView]; //轨道前景 UIView *trackView = [[UIView alloc] initWithFrame:CGRectMake(1.5, 9, self.bounds.size.width - 3, 2)]; trackView.backgroundColor = [UIColor greenColor]; trackView.layer.cornerRadius = 1.f; trackView.layer.masksToBounds = YES; [tapView addSubview:trackView]; _trackView = trackView; //滑块 UIImageView *thumb = [[UIImageView alloc] initWithFrame:CGRectMake(self.bounds.size.width - 20, 34, 20, 20)]; [thumb setImage:[UIImage imageNamed:@"alert_teacherEva_sliderImg"]]; thumb.userInteractionEnabled = YES; thumb.contentMode = UIViewContentModeCenter; [thumb addGestureRecognizer:[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)]]; [self addSubview:thumb]; _thumb = thumb; //级别标签 UILabel *levelLable = [[UILabel alloc] initWithFrame:CGRectMake(0, CGRectGetMaxY(thumb.frame) + 7, self.bounds.size.width, 13)]; levelLable.text = @"非常满意"; levelLable.textColor = [UIColor blackColor]; levelLable.font = [UIFont systemFontOfSize:13.f]; levelLable.textAlignment = NSTextAlignmentCenter; [self addSubview:levelLable]; _levelLable = levelLable; } return self;}- (void)setScore:(NSInteger)score{ _score = score; //刷新视图 [self reloadViewWithThumbCeneterX:score / 10.0 * self.bounds.size.width];}//点击滑动条- (void)handleTap:(UITapGestureRecognizer *)sender{ //刷新视图 [self reloadViewWithThumbCeneterX:[sender locationInView:self].x];}//滑动滑块- (void)handlePan:(UIPanGestureRecognizer *)sender{ //获取偏移量 CGFloat moveX = [sender translationInView:self].x; //重置偏移量，避免下次获取到的是原基础的增量 [sender setTranslation:CGPointMake(0, 0) inView:self]; //计算当前中心值 CGFloat centerX = _thumb.centerX + moveX; //防止瞬间大偏移量滑动影响显示效果 if (centerX < 10) centerX = 10; if (centerX > self.bounds.size.width - 10) centerX = self.bounds.size.width - 10; //刷新视图 [self reloadViewWithThumbCeneterX:centerX];}- (void)reloadViewWithThumbCeneterX:(CGFloat)thumbCeneterX{ //更新轨道前景色 _trackView.frameWidth = thumbCeneterX; //更新滑块位置 _thumb.centerX = thumbCeneterX; if (_thumb.centerX < 10) { _thumb.centerX = 10; }else if (_thumb.centerX > self.bounds.size.width - 10) { _thumb.centerX = self.bounds.size.width - 10; } //更新箭头位置 _arrowImage.centerX = _thumb.centerX; //更新气泡标签位置（气泡图片宽度74，实际内容宽度66） _bubbleImage.centerX = _thumb.centerX; if (_bubbleImage.centerX < 33) { _bubbleImage.centerX = 33; }else if (_bubbleImage.centerX > self.bounds.size.width - 33) { _bubbleImage.centerX = self.bounds.size.width - 33; } //更新分数标签位置 _scoreLabel.centerX = _bubbleImage.centerX; //分数，四舍五入取整 _score = round(thumbCeneterX / self.bounds.size.width * 10); //更新标签内容 _scoreLabel.text = [NSString stringWithFormat:@"%ld", _score]; if (_score <= 3) { _levelLable.text = @"极不满意"; }else if (_score <= 5) { _levelLable.text = @"不满意"; }else if (_score <= 7) { _levelLable.text = @"一般"; }else if (_score <= 9) { _levelLable.text = @"满意"; }else if (_score == 10) { _levelLable.text = @"非常满意"; }}@end
Demo 下载链接
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