使UIScrollView的子控件在scrolling的過程中，子控件不滾動(固定在某個位置)

受本篇問答的啟發

http://stackoverflow.com/questions/11272847/make-uiview-in-uiscrollview-stick-to-the-top-when-scrolled-up

修改代碼如下

注意：使UIScrollView的子控件self.letter在scrolling的過程中，子控件self.letter向上不滾動(固定在某個位置)，向下可隨著self.scrollView一起滾動

其中self.letterY是在self.letter(本身是一個UIView)初始化的時候把自身的frame.origin.Y值存儲到全局變量self.letterY中

#PRagma mark UIScrollViewDelegate- (void)scrollViewDidScroll:(UIScrollView *)scrollView{        CGPoint point = scrollView.contentOffset;        CGFloat Y = point.y;        CGRect frame = self.letter.frame;        if (Y > 0) {            if (Y <= (self.letterY + 35)) {                frame.origin.y = self.letterY + Y;            } else {                frame.origin.y = Y;            }        } else {            frame.origin.y = self.letterY;        }        self.letter.frame = frame;                if (point.y > 95) {            scrollView.contentOffset = CGPointMake(point.x, 95);        }}
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