学步园

边框效果：

//_myImageView边框效果
  CALayer *layer = [_myImageView layer];
  [layer setCornerRadius:10];
  [layer setMasksToBounds:YES];//设置边框可见
  layer.borderColor = [[UIColor yellowColor] CGColor];
  [layer setBorderWidth:1];
  [control addSubview:_myImageView];

阴影层：

CALayer *layer = [imageView layer];
layer.shadowOffset = CGSizeMake(0, 3);
layer.shadowRadius = 5.0;
layer.shadowColor = [UIColor blackColor].CGColor;
layer.shadowOpacity = 0.8;