IOS 自定義進度條 ProgressView,好的進度條，讓人賞心悅目，在等待的時候不是那麼煩躁，也算是增加用戶體驗吧！

進度條在iOS開發中很常見的，我在項目開發中也寫過好多進度條，有好多種類的，條形，圓形等，今天給大家總結一種條形的開發進度條。

簡單思路：

 1.自定義進度條先繼承UIView 建立一個CustomBarProgressView
 2.在.H文件中外漏的方法《開始的方法》《初始化的方法》
 3.在.M文件中 利用定時器改變位置 實現進度條

#效果圖

#部分代碼

-(instancetype)initWithFrame:(CGRect)frame withStartNum:(CGFloat)startNum withEndNum:(CGFloat)endNum withSignNum:(CGFloat)signNum withTime:(CGFloat)time{
  if (self = [super initWithFrame:frame]) {

    self.startNum = startNum;
    self.endNum = endNum;
    self.signNum = signNum;

    if(time == 0){
      self.time = 0.1;
    }else{
      self.time = time;
    }

    [self setUpSubViews];
  }
  return self;
}

- (void)setUpSubViews
{
  UIView *backView = [[UIView alloc] init];
  backView.backgroundColor =BoomViewColor;
  backView.layer.cornerRadius = CornerRadius;
  backView.layer.masksToBounds = YES;
  [self addSubview:backView];
  self.backView = backView;

  UIView *fontView = [[UIView alloc] init];
  fontView.backgroundColor = UpViewColor;
  fontView.layer.cornerRadius = CornerRadius;
  fontView.layer.masksToBounds = YES;
  [self addSubview:fontView];
  self.fontView = fontView;

}

-(void)progressViewStart{
  if (self.timer == nil) {
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
      self.timer = [NSTimer scheduledTimerWithTimeInterval:self.time target:self selector:@selector(changeProgressViewFrame:) userInfo:nil repeats:YES];
      [[NSRunLoop mainRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];
    });

  }
}

-(void)changeProgressViewFrame:(NSTimer *)timer{

  //位置計算
  CGFloat signProgress = (self.signNum - self.startNum) / (self.endNum - self.startNum);
  NSLog(@"==>>>%f",self.progress);
  if (self.progress >= signProgress){
    [self.timer invalidate];
    self.timer = nil;
    return;
  }

  self.progress += 0.01;
  [self setNeedsLayout];

}

-(void)layoutSubviews{
  [super layoutSubviews];
  NSLog(@"==>>>%f",self.progress);
  self.backView.frame = self.bounds;
  self.fontView.frame = self.bounds;
  self.fontView.width = self.width * self.progress;

}

PS:可以自己增加 進度條文字等修改大小 樣式

別小看任何人，越不起眼的人。往往會做些讓人想不到的事。。。

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