//- (UIView *)createTimeBG

//{

// UIView *view = [[UIView alloc]init];

// view.backgroundColor = [UIColor clearColor];

// view.layer.shadowOffset = CGSizeMake(0, 2);

// view.layer.shadowColor = [[UIColor blackColor] colorWithAlphaComponent:0.35].CGColor;

// view.layer.shadowOpacity = 1;

//

// CALayer *sublayer =[CALayer layer];

// sublayer.frame = CGRectMake(0, 0, 20, 20);

// sublayer.backgroundColor = [UIColor sy_black2Color].CGColor;

// sublayer.cornerRadius = 2;

// sublayer.masksToBounds = YES;

// [view.layer addSublayer:sublayer];

// return view;

//}

ios 視圖既顯示陰影又有圓角實現