iOS使用UIBezierPath实现ProgressView

//
// ViewController.m
// ProgressViewDemo
//
// Created by 思 彭 on 2017/4/20.
// Copyright © 2017年 思 彭. All rights reserved.
//

#import "ViewController.h"
#import "ProgressTableViewCell.h"

@interface ViewController ()<UITableViewDelegate, UITableViewDataSource>

@property (nonatomic, strong) UITableView *tableView;
@property (nonatomic, strong) CAShapeLayer *layer;

@end

@implementation ViewController

- (void)viewDidLoad {
  [super viewDidLoad];
  self.navigationItem.title = @"ProgressDemo";
  [self setUI];
}

#pragma mark - 设置界面

- (void)setUI {
  
  self.tableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height) style:UITableViewStyleGrouped];
  self.tableView.delegate = self;
  self.tableView.dataSource = self;
  self.tableView.backgroundColor = [UIColor clearColor];
  // 注册cell
  [self.tableView registerClass:[ProgressTableViewCell class] forCellReuseIdentifier:@"cell"];
  self.tableView.tableFooterView = [[UIView alloc]init];
  [self.view addSubview:self.tableView];
}

#pragma mark - UITableViewDataSource

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
  
  return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
  
  return 5;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
  
  ProgressTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];
  return cell;
}

#pragma mark - UITableViewDelegate

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
  
  return 0.001f;;
}

- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section {
  
  return 0.0001f;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
  
  return 44;
}

@end

//
// ProgressTableViewCell.m
// ProgressViewDemo
//
// Created by 思 彭 on 2017/4/21.
// Copyright © 2017年 思 彭. All rights reserved.
//

#import "ProgressTableViewCell.h"
#import "Masonry.h"
#import "ProgressView.h"

@interface ProgressTableViewCell ()

@property (nonatomic, strong) UILabel *titleLabel;
@property (nonatomic, strong) ProgressView *progressView;
@property (nonatomic, strong) UILabel *numberLabel;

@end

@implementation ProgressTableViewCell

- (void)awakeFromNib {
  [super awakeFromNib];
  // Initialization code
}

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
  
  if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
    [self createSubViews];
    [self layOut];
  }
  return self;
}

- (void)createSubViews {
  
  self.titleLabel = [[UILabel alloc]init];
  self.titleLabel.font = [UIFont systemFontOfSize:16];
  self.titleLabel.text = @"西单大悦城";
  self.titleLabel.textAlignment = NSTextAlignmentLeft;
  [self.contentView addSubview:self.titleLabel];
  self.progressView = [[ProgressView alloc]init];
  self.progressView.backgroundColor = [UIColor whiteColor];
  self.progressView.progress = arc4random_uniform(100) + 40;
  [self.contentView addSubview:self.progressView];
  self.numberLabel = [[UILabel alloc]init];
  self.numberLabel.font = [UIFont systemFontOfSize:16];
  self.numberLabel.text = @"￥2000";
  self.numberLabel.textAlignment = NSTextAlignmentRight;
  [self.contentView addSubview:self.numberLabel];
}

- (void)layOut {
  
  [self.titleLabel mas_makeConstraints:^(MASConstraintMaker *make) {
    make.left.mas_equalTo(self.contentView).offset(10);
    make.centerY.mas_equalTo(self.contentView);
//    make.width.greaterThanOrEqualTo(@(70));
    make.width.mas_equalTo(self.contentView.frame.size.width * 0.3);
  }];
  [self.progressView mas_makeConstraints:^(MASConstraintMaker *make) {
    make.left.mas_equalTo(self.titleLabel.mas_right).offset(10);
    make.height.mas_equalTo(20);
    make.centerY.mas_equalTo(self.titleLabel.mas_centerY);
    make.width.mas_equalTo(self.contentView.frame.size.width * 0.4);
  }];
  [self.numberLabel mas_makeConstraints:^(MASConstraintMaker *make) {
    make.left.mas_equalTo(self.progressView.mas_right).offset(10);
    make.centerY.mas_equalTo(self.contentView);
    make.right.mas_equalTo(self.contentView).offset(-10);
  }];
}

@end

//
// ProgressView.m
// ProgressViewDemo
//
// Created by 思 彭 on 2017/4/20.
// Copyright © 2017年 思 彭. All rights reserved.
//

#import "ProgressView.h"

@interface ProgressView ()

@end

@implementation ProgressView


-(void)drawRect:(CGRect)rect{
  
  // 创建贝瑟尔路径
  
  /*
  CGFloat width = self.progress / rect.size.width * rect.size.width;
  // 显示的宽度 = 服务器返回的数值 / 设置的总宽度 * 满值;
   
   显示的宽度= 满值 * 比例值
   比例值 = 服务器返回的宽度 / 满值
   */
  
  CGFloat width = rect.size.width * self.progress / rect.size.width;
   // 显示的宽度 = 服务器返回的数值 * 设置的总宽度 / 满值;
  UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, width, rect.size.height) byRoundingCorners:UIRectCornerTopRight|UIRectCornerBottomRight cornerRadii:CGSizeMake(rect.size.height, rect.size.height)];
  [[UIColor redColor] setFill];
  [path fill];
}

- (void)setProgress:(CGFloat)progress{
  
  _progress = progress;
  // 重绘，系统会先创建与view相关联的上下文，然后再调用drawRect
  [self setNeedsDisplay];
}


@end