ios -uiview uitabviewcell uicollectioncell 的view layer修改圆角和shadow

@interface UIView (Add)

- (void)setCornerRadius:(CGFloat)radius withShadow:(BOOL)shadow withOpacity:(CGFloat)opacity;

@end

@implementation UIView (Add)

- (void)setCornerRadius:(CGFloat)radius withShadow:(BOOL)shadow withOpacity:(CGFloat)opacity {

    self.layer.cornerRadius = radius;

    if (shadow) {

        self.layer.shadowColor = [UIColor lightGrayColor].CGColor;

        self.layer.shadowOpacity = opacity;

        self.layer.shadowOffset = CGSizeMake(-1, 1);

        self.layer.shadowRadius = radius;

        self.layer.shouldRasterize = NO;

        self.layer.shadowPath = [[UIBezierPath bezierPathWithRoundedRect:[self bounds] cornerRadius:radius] CGPath];

    }

    self.layer.masksToBounds = !shadow;

}

@end

然后再实现里面：

 (void)layoutSubviews {

    [super layoutSubviews];

    [self setCornerRadius:2 withShadow:YES withOpacity:0.1];

}

可以实现一些在布局已定，修改小的地方。

手打。。。