iOS如何为导航栏添加播放动画

FLAudioVisualizerView.m

#import "FLAudioVisualizerView.h"

@interface FLAudioVisualizerView ()

@property (nonatomic, strong) NSArray<UIView *> *barList;
@property (nonatomic, assign) BOOL isAniamting;

@end

@implementation FLAudioVisualizerView

#pragma mark -

- (id)initWithFrame:(CGRect)frame
{
  if (self = [super initWithFrame:frame]) {
    [self setBarCount:4];
    _barSpace = 5;
    _barColor = [UIColor whiteColor];
    self.cornerRadius = 2;
    self.barHeightRateList = @[@(0.4), @(0.75), @(0.55), @(0.95)];
    self.transform = CGAffineTransformMakeRotation(M_PI);
    self.aniamteOffsetList = @[[NSValue valueWithCGPoint:CGPointMake(0.1, 0.4)],
                  [NSValue valueWithCGPoint:CGPointMake(0.75, 0.3)],
                  [NSValue valueWithCGPoint:CGPointMake(0.2, 0.55)],
                  [NSValue valueWithCGPoint:CGPointMake(0.94, 0.4)],
                  ];
    self.contentInsets = UIEdgeInsetsZero;
  }
  return self;
}

- (void)layoutSubviews
{
  [super layoutSubviews];
  CGRect rect = self.bounds;
  if (fabs(rect.size.width) < 1e-3 || fabs(rect.size.height) < 1e-3 || rect.size.width < 0 || rect.size.height < 0 ) {
    return;
  }
  rect = CGRectWithEdgeInserts(rect, self.contentInsets);
  __block CGRect barRect = rect;
  barRect.size.width = (rect.size.width - (self.barCount - 1) * self.barSpace) / self.barCount;
  NSArray<NSNumber *> *barHeightRateList = self.barHeightRateList.reverseObjectEnumerator.allObjects;
  [self.barList enumerateObjectsUsingBlock:^(UIView * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
    obj.layer.anchorPoint = CGPointZero;
    CGFloat rate = 1.0;
    if (idx < barHeightRateList.count) rate = barHeightRateList[idx].floatValue;
    barRect.size.height = rect.size.height * rate;
    obj.frame = barRect;
    barRect.origin.x += barRect.size.width + self.barSpace;
  }];
}

#pragma mark -

static CGRect CGRectWithEdgeInserts(CGRect rect, UIEdgeInsets inserts)
{
  rect.origin.x += inserts.left;
  rect.origin.y += inserts.top;
  rect.size.width -= inserts.left + inserts.right;
  rect.size.height -= inserts.top + inserts.bottom;
  return rect;
}

#pragma mark -

- (void)setBarCount:(NSInteger)barCount
{
  _barCount = barCount;
  NSInteger diff = self.barList.count - barCount;
  if (diff > 0) {
    NSArray<UIView *> *removeBarViewList = [self.barList subarrayWithRange:NSMakeRange(barCount, diff)];
    [removeBarViewList makeObjectsPerformSelector:@selector(removeFromSuperview)];
    self.barList = [self.barList subarrayWithRange:NSMakeRange(0, barCount)];
  } else if (diff < 0) {
    diff = -diff;
    NSMutableArray *addBarViewList = [NSMutableArray arrayWithCapacity:diff];
    for (NSInteger index = 0; index < diff; index ++) {
      UIView *imageView = [[UIView alloc] init];
      imageView.clipsToBounds = YES;
      imageView.layer.cornerRadius = self.cornerRadius;
      [addBarViewList addObject:imageView];
      imageView.backgroundColor = [UIColor whiteColor];
    }
    if (self.barList) {
      self.barList = [self.barList arrayByAddingObjectsFromArray:addBarViewList];
    } else {
      self.barList = addBarViewList;
    }
  }
  [self.barList enumerateObjectsUsingBlock:^(UIView * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
    [self addSubview:obj];
  }];
}

- (void)setCornerRadius:(CGFloat)cornerRadius
{
  _cornerRadius = cornerRadius;
  [self.barList enumerateObjectsUsingBlock:^(UIView * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
    obj.layer.cornerRadius = cornerRadius;
  }];
}

- (void)setBarColor:(UIColor *)barColor
{
  [self.barList enumerateObjectsUsingBlock:^(UIView * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
    obj.backgroundColor = barColor;
  }];
}

- (void)aniamteWithBar:(UIView *)bar startHeight:(CGFloat)startHeight endHeight:(CGFloat)endHeight
{
  CABasicAnimation * animation;
  animation = [CABasicAnimation animationWithKeyPath:@"bounds.size.height"];
  animation.fromValue = [NSNumber numberWithFloat:startHeight];
  animation.toValue = [NSNumber numberWithFloat:endHeight];
  animation.duration = 0.25;
  animation.repeatCount = MAXFLOAT;
  animation.autoreverses = YES;
  [bar.layer addAnimation:animation forKey:@"bounds.size.height"];
}

- (void)restart
{
  [self stop];
  [self start];
}

- (void)start
{
  if (self.isAniamting) return;
  self.isAniamting = YES;
  NSArray<NSValue *> *aniamteOffsetList = self.aniamteOffsetList.reverseObjectEnumerator.allObjects;
  [self.barList enumerateObjectsUsingBlock:^(UIView * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
    if (idx < aniamteOffsetList.count) {
      CGRect rect = CGRectWithEdgeInserts(self.bounds, self.contentInsets);
      CGPoint offset = aniamteOffsetList[idx].CGPointValue;
      [self aniamteWithBar:obj startHeight:rect.size.height * offset.x endHeight:rect.size.height * offset.y];
    }
  }];
}

- (void)stop
{
  self.isAniamting = NO;
  [self.barList enumerateObjectsUsingBlock:^(UIView * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
    [obj.layer removeAllAnimations];
  }];
}

@end

								 
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