一个简单的进度条控件UIProgressView

UIProgressView大多数情况下用来显示进度的，如音乐，视频的播放进度，和文件的上传下载进度等
需求如下：

屏幕快照 2018-09-10 下午3.20.27.png

是不是很简单啊？无非就是根据服务端返回的当前人数，计算出一个百分百，显示在进度条UIProgressView控件上，对，就这么简单。
代码块

#import "SCEGProgressCell.h"
#import "SCEGProgressModel.h"

@interface SCEGProgressCell()
@property (nonatomic,strong)UIView *backView;
@property (nonatomic, strong) UIImageView *iconImageView;
@property (nonatomic, strong) UILabel *titleLabel;
@property (nonatomic, strong) UILabel *subTitleLabel;
@property (nonatomic, strong) UILabel *rightLabel;
@property (nonatomic, strong) UIProgressView *progress;
@end

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

- (void)setViewWithModel:(SCEGProgressModel *)obj{
    self.titleLabel.text = @"西山·悦庭";
    self.subTitleLabel.text = @"当前进度30/300";
    self.rightLabel.text = @"实施人员：2人";
}

- (void)addSubViews{
    self.backgroundColor = [UIColor SCBackGroundColor];
    self.backView.backgroundColor = [UIColor SCWhiteColor];
    
    [self addSubview:self.backView];
    [self.backView addSubview:self.iconImageView];
    [self.backView addSubview:self.titleLabel];
    [self.backView addSubview:self.subTitleLabel];
    [self.backView addSubview:self.rightLabel];
    [self.backView addSubview:self.progress];

}

- (void)setConstraints{
    [self.backView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.mas_equalTo(self);
        make.top.mas_equalTo(self);
        make.width.mas_equalTo(kSCREEN_WIDTH);
        make.bottom.mas_equalTo(-11);
    }];
    
    [self.iconImageView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.mas_equalTo(self.backView).offset(23);
        make.left.mas_equalTo(self.backView).offset(16);
        make.height.width.mas_equalTo(20);
    }];
    
    [self.titleLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.mas_equalTo(self.backView).offset(20);
        make.left.mas_equalTo(self.iconImageView.mas_right).offset(10);
        make.height.mas_equalTo(22);
        make.width.mas_equalTo(kSCREEN_WIDTH - 20 - 16 - 10 - 15);
    }];
    
    [self.subTitleLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.mas_equalTo(self.titleLabel.mas_bottom).offset(10);
        make.left.mas_equalTo(self.backView).offset(16);
        make.height.mas_equalTo(20);
        make.width.mas_equalTo(kSCREEN_WIDTH - 20 - 16 - 10 - 15 - 100);
    }];
    
    [self.rightLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.right.mas_equalTo(-15);
        make.centerY.mas_equalTo(self.subTitleLabel.mas_centerY);
        make.height.mas_equalTo(20);
        make.width.mas_equalTo(120);
    }];
    
    [self.progress mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.mas_equalTo(self.subTitleLabel.mas_bottom).offset(16);
        make.left.mas_equalTo(self.backView).offset(16);
        make.height.mas_equalTo(4);
        make.width.mas_equalTo(kSCREEN_WIDTH - 30);
    }];
}

-(UIView *)backView{
    return _backView = _backView?:[[UIView alloc] initWithFrame:CGRectZero];
}

- (UIImageView *)iconImageView{
    return _iconImageView = _iconImageView?:[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"unitRegion"]];
}

- (UILabel *)titleLabel{
    if (!_titleLabel) {
        _titleLabel = [[UILabel alloc] init];
        _titleLabel.textColor = [UIColor SCTextBlackColor];
        _titleLabel.font = [UIFont sysFont16];
        _titleLabel.numberOfLines = 0;
    }
    return _titleLabel;
}

- (UILabel *)subTitleLabel{
    if (!_subTitleLabel) {
        _subTitleLabel = [[UILabel alloc] init];
        _subTitleLabel.textColor = [UIColor SCTextLightGrayColor];
        _subTitleLabel.font = [UIFont sysFont14];
    }
    return _subTitleLabel;
}

- (UILabel *)rightLabel{
    if (!_rightLabel) {
        _rightLabel = [[UILabel alloc] init];
        _rightLabel.textColor = [UIColor SCTextLightGrayColor];
        _rightLabel.font = [UIFont sysFont14];
        _rightLabel.textAlignment = NSTextAlignmentRight;
    }
    return _rightLabel;
}

-(UIProgressView *)progress{
    if (!_progress) {
        //进度条高度不可修改
        _progress = [[UIProgressView alloc] initWithFrame:CGRectZero];
        //设置进度条的颜色
        _progress.progressTintColor = [UIColor SCTextBlueColor];
        //设置进度条的当前值，范围：0~1；
        _progress.progress = 0.5;
        _progress.progressViewStyle = UIProgressViewStyleDefault;
    }
    return _progress;
}

可以根据model中获取的当前值，改变进度条的显示范围
_progress.progress = 0.5;
同样也可以progressTintColor改变进度条的颜色。设置未走过的进度条颜色设置未走过进度的进度条颜色
@property(nonatomic, retain) UIColor* trackTintColor;

具体使用：

- (UITableView *)mTableView{
    if (!_mTableView) {
        _mTableView = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];
        _mTableView.delegate = self;
        _mTableView.dataSource = self;
        _mTableView.estimatedRowHeight = 112;
        _mTableView.rowHeight = UITableViewAutomaticDimension;
        if (@available(iOS 11.0, *)) {
            _mTableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
        } else {
            self.automaticallyAdjustsScrollViewInsets = NO;
        }
        [_mTableView registerClass:[SCEGProgressCell class] forCellReuseIdentifier:@"SCEGProgressCell"];
        _mTableView.backgroundColor = [UIColor SCBackGroundColor];
        _mTableView.separatorStyle = UITableViewCellSeparatorStyleNone;
        
        
    }
    return _mTableView;
}

主要是这一句：
[_mTableView registerClass:[SCEGProgressCell class] forCellReuseIdentifier:@"SCEGProgressCell"];