In UIWebview scroll events aren't fired. This has the effect of making affix look buggy as its position isnd't updated until after scroll is done. To mitigate the effects of this, we could add a touchmove event listener to update the affix position when the user is scrolling via moving their finger.

this.$target=$(this.options.target).on('scroll.bs.affix.data-api',$.proxy(this.checkPosition,this)).on('touchmove.bs.affix.data-api',$.proxy(this.checkPosition,this)).on('click.bs.affix.data-api',$.proxy(this.checkPositionWithEventLoop,this))