i can't change dismissButton style

[coolgo]

i want to change the dismissbutton style but ,how can i do

[coolgo]

thanks ,i create a simple category to friendly solve it.
@interface RNBlurModalView (CLFIX)
-(void)changeCloseButtonImage:(UIImage*)img;
@EnD
@implementation RNBlurModalView (CLFIX)

-(void)changeCloseButtonImage:(UIImage*)img{

for (UIView* view in self.subviews) {
    if ([view isKindOfClass:[UIButton class]]) {
        DLog(@"btn:%@",view);
        UIButton *btn=(UIButton*)view;
        [btn setBackgroundImage:img forState:UIControlStateNormal];
    }
}

}
@EnD

so,i can easily change the closebutton image