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iOS知识小集-171023

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UITableView AccessoryView TintColor

通过设置Cell的TintColor来设置AccessoryView的tintColor。

Git Rebase

git rebase会删除merge commit。
进行merge操作后不要向其amend代码。

UITableViewCell

注意在返回cell的代理方法中，不要重复创建view。

UITableViewCell高度自适应

  1. estimatedRowHeight；
  2. -systemLayoutSizeFittingSize: + cache height；
  3. ComponentKit；

layoutIfNeeded、setNeedsLayout、setNeedsDisplay

// TODO

动态更新Cell高度

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  [self.tableView beginUpdates];
  [self.tableView endUpdates];

UIImageView Animation

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  self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 200, 50, 50)];
  self.imageView.animationImages = @[[UIImage imageNamed:@"Image1"],[UIImage imageNamed:@"Image2"],[UIImage imageNamed:@"Image3"]];
  self.imageView.animationDuration = 0.75;
  self.imageView.animationRepeatCount = 10;
  [self.view addSubview:self.imageView];
  [self.imageView startAnimating];
  [self.imageView stopAnimating];

AVAudioPlayer Simple Use

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- (AVAudioPlayer *)startAudioPlayer {
  if (!_startAudioPlayer) {
    NSString *path = [NSString stringWithFormat:@"%@/startAudio.wav", [[NSBundle mainBundle] resourcePath]];
    NSURL *soundURL = [NSURL fileURLWithPath:path];
    NSError *error = nil;
    _startAudioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:soundURL error:&error];
    if (error) {
      DDLogDebug(@"Can't find audio file %@", error.localizedDescription);
    }
  }
  return _startAudioPlayer;
}

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  [self.startAudioPlayer play];
  [self.startAudioPlayer pause];

模糊效果

UIBlurEffect

可以选择模糊亮度，但无法自定义模糊半径。

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  UIBlurEffect *blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
  UIVisualEffectView *blurView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];
  blurView.frame = myView.bounds;
  [myView addSubview:blurView];

CIImage & CIFilter

可以选择滤波算法，并设置滤波参数。

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- (UIImage *)convertToBlurImage:(UIImage *)image {
  //  create input image
  CIImage *inputImage = [CIImage imageWithCGImage:[image CGImage]];
  //  create filter
  CIFilter *gaussianBlurFilter = [CIFilter filterWithName:@"CIGaussianBlur"];
  //  set filter parameters
  [gaussianBlurFilter setDefaults];
  [gaussianBlurFilter setValue:inputImage forKey:kCIInputImageKey];
  [gaussianBlurFilter setValue:@6 forKey:kCIInputRadiusKey];
  //  create output image
  CIImage *outputImage = [gaussianBlurFilter outputImage];
  CIContext *context = [CIContext contextWithOptions:nil];
  CGImageRef cgimg = [context createCGImage:outputImage fromRect:[inputImage extent]];
  //  get UIImage
  UIImage *convertedImage = [UIImage imageWithCGImage:cgimg];
  return convertedImage;
}

UIView to UIImage

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- (UIImage *)imageFromUIView:(UIView *)view {
  UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, 0.0);
  //  render view in context
  [view.layer renderInContext:UIGraphicsGetCurrentContext()];
  //  get image from context
  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  return image;
}

原始地址： http://sxgfxm.github.io/blog/2017/11/02/ioszhi-shi-xiao-ji-171023/
written by Light  posted at http://sxgfxm.github.io

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