源码

将步骤进度条封装成一个 HQLStepView 类，它是 UIView 的子类。

HQLStepView.h 文件

#import @interface HQLStepView : UIView// 指定初始化方法- (instancetype)initWithFrame:(CGRect)frame titlesArray:(NSArray *)titlesArray stepIndex:(NSUInteger)stepIndex;// 设置当前步骤- (void)setStepIndex:(NSUInteger)stepIndex animation:(BOOL)animation;@end

HQLStepView.m 文件

#import "HQLStepView.h"// 步骤条主题色#define TINT_COLOR [UIColor colorWithRed:35/255.f green:135/255.f blue:255/255.f alpha:1]@interface HQLStepView ()@property (nonatomic, copy) NSArray *titlesArray;@property (nonatomic, assign) NSUInteger stepIndex;@property (nonatomic, strong) UIProgressView *progressView;@property (nonatomic, strong) NSMutableArray *circleViewArray;@property (nonatomic, strong) NSMutableArray *titleLabelArray;@property (nonatomic, strong) UILabel *indicatorLabel;@end@implementation HQLStepView#pragma mark - Init- (instancetype)initWithFrame:(CGRect)frame titlesArray:(NSArray *)titlesArray stepIndex:(NSUInteger)stepIndex { self = [super initWithFrame:frame]; if (self) { _titlesArray = [titlesArray copy]; _stepIndex = stepIndex; // 进度条 [self addSubview:self.progressView]; for (NSString *title in _titlesArray) {  // 圆圈  UIView *circle = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 13, 13)];  circle.backgroundColor = [UIColor lightGrayColor];  circle.layer.cornerRadius = 13.0f / 2;  [self addSubview:circle];  [self.circleViewArray addObject:circle];  // 标题  UILabel *label = [[UILabel alloc] init];  label.text = title;  label.font = [UIFont systemFontOfSize:14];  label.textAlignment = NSTextAlignmentCenter;  [self addSubview:label];  [self.titleLabelArray addObject:label]; } // 当前索引数字 [self addSubview:self.indicatorLabel]; } return self;}// 布局更新页面元素- (void)layoutSubviews { NSInteger perWidth = self.frame.size.width / self.titlesArray.count; // 进度条 self.progressView.frame = CGRectMake(0, 0, self.frame.size.width - perWidth, 1); self.progressView.center = CGPointMake(self.frame.size.width / 2, self.frame.size.height / 4); CGFloat startX = self.progressView.frame.origin.x; for (int i = 0; i < self.titlesArray.count; i++) { // 圆圈 UIView *cycle = self.circleViewArray[i]; if (cycle) {  cycle.center = CGPointMake(i * perWidth + startX, self.progressView.center.y); } // 标题 UILabel *label = self.titleLabelArray[i]; if (label) {  label.frame = CGRectMake(perWidth * i, self.frame.size.height / 2, self.frame.size.width / self.titlesArray.count, self.frame.size.height / 2 ); } } self.stepIndex = self.stepIndex;}#pragma mark - Custom Accessors- (UIProgressView *)progressView { if (!_progressView) { _progressView = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault]; _progressView.progressTintColor = TINT_COLOR; _progressView.progress = self.stepIndex / ((self.titlesArray.count - 1) * 1.0); } return _progressView;}- (UILabel *)indicatorLabel { if (!_indicatorLabel) { _indicatorLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 23, 23)]; _indicatorLabel.textColor = TINT_COLOR; _indicatorLabel.textAlignment = NSTextAlignmentCenter; _indicatorLabel.backgroundColor = [UIColor whiteColor]; _indicatorLabel.layer.cornerRadius = 23.0f / 2; _indicatorLabel.layer.borderColor = [TINT_COLOR CGColor]; _indicatorLabel.layer.borderWidth = 1; _indicatorLabel.layer.masksToBounds = YES; } return _indicatorLabel;}- (NSMutableArray *)circleViewArray { if (!_circleViewArray) { _circleViewArray = [[NSMutableArray alloc] initWithCapacity:self.titlesArray.count]; } return _circleViewArray;}- (NSMutableArray *)titleLabelArray { if (!_titleLabelArray) { _titleLabelArray = [[NSMutableArray alloc] initWithCapacity:self.titlesArray.count]; } return _titleLabelArray;}// 设置当前进度索引，更新圆形图片、文本颜色、当前索引数字- (void)setStepIndex:(NSUInteger)stepIndex { for (int i = 0; i < self.titlesArray.count; i++) { UIView *cycle = self.circleViewArray[i]; UILabel *label = self.titleLabelArray[i]; if (stepIndex >= i) {  cycle.backgroundColor = TINT_COLOR;  label.textColor = TINT_COLOR; } else {  cycle.backgroundColor = [UIColor lightGrayColor];  label.textColor = [UIColor lightGrayColor]; } }}#pragma mark - Public- (void)setStepIndex:(NSUInteger)stepIndex animation:(BOOL)animation { if (stepIndex < self.titlesArray.count) { // 更新颜色 self.stepIndex = stepIndex; // 设置进度条 [self.progressView setProgress:stepIndex / ((self.titlesArray.count - 1) * 1.0) animated:animation]; // 设置当前索引数字 self.indicatorLabel.text = [NSString stringWithFormat:@"%lu", stepIndex + 1]; self.indicatorLabel.center = ((UIView *)[self.circleViewArray objectAtIndex:stepIndex]).center; }}@end

接口调用：

- (void)viewDidLoad { [super viewDidLoad]; // 初始化 _hqlStepView = [[HQLStepView alloc] initWithFrame:CGRectMake(0, 200, self.view.frame.size.width, 60) titlesArray:@[@"第一步", @"第二步", @"第三步"] stepIndex:0]; [self.view addSubview:_hqlStepView];}- (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; // 设置当前步骤，步骤索引=数组索引 [_hqlStepView setStepIndex:0 animation:YES];}