BUttonフィレット枠線の設定

<span style="font-size:24px;">UIButton *button = [UIButton buttonWithType:(UIButtonTypeCustom)];
    button.frame = CGRectMake(100, 40, 100, 30);
    //  
    [button.layer setMasksToBounds:YES];
    [button.layer setCornerRadius:10];

    <p style="margin-top: 0px; margin-bottom: 0px; font-size: 14px; line-height: normal; font-family: Menlo;"><span style="color: rgb(255, 255, 255); font-variant-ligatures: no-common-ligatures;"> </span><span style="color:#ff0000;"><span style="font-variant-ligatures: no-common-ligatures;">   </span><span style="font-variant-ligatures: no-common-ligatures;">button</span><span style="font-variant-ligatures: no-common-ligatures;">.</span><span style="font-variant-ligatures: no-common-ligatures;">layer</span><span style="font-variant-ligatures: no-common-ligatures;">.</span><span style="font-variant-ligatures: no-common-ligatures;">borderWidth</span><span style="font-variant-ligatures: no-common-ligatures;"> = </span><span style="font-variant-ligatures: no-common-ligatures;">1</span><span style="font-variant-ligatures: no-common-ligatures;">; //  1</span></span></p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 14px; line-height: normal; font-family: Menlo;"><span style="color:#ff0000;"><span style="font-variant-ligatures: no-common-ligatures;">    </span><span style="font-variant-ligatures: no-common-ligatures;">button</span><span style="font-variant-ligatures: no-common-ligatures;">.</span><span style="font-variant-ligatures: no-common-ligatures">layer</span><span style="font-variant-ligatures: no-common-ligatures;">.</span><span style="font-variant-ligatures: no-common-ligatures">borderColor</span><span style="font-variant-ligatures: no-common-ligatures;"> = [</span><span style="font-variant-ligatures: no-common-ligatures">UIColor</span><span style="font-variant-ligatures: no-common-ligatures;"> </span><span style="font-variant-ligatures: no-common-ligatures">greenColor</span><span style="font-variant-ligatures: no-common-ligatures;">].</span><span style="font-variant-ligatures: no-common-ligatures">CGColor</span><span style="font-variant-ligatures: no-common-ligatures;">;//  </span></span></p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 14px; line-height: normal; font-family: Menlo;"><span style="color:#ff0000;"><span style="font-variant-ligatures: no-common-ligatures;">    button.titleLabel.font = [UIFont sys....:12]; // button  12  </span></span></p><div><span style="font-variant-ligatures: no-common-ligatures; color: #ffffff">
</span></div>
    //  
    [button setTitle:@" " forState:(UIControlStateNormal)];
    button.backgroundColor = [UIColor greenColor];
    //  
    [button setTitleColor:[UIColor blackColor] forState:(UIControlStateNormal)];</span>