先用xcode5.1.1或更低版本创建一个Category，如图：
然后拷贝以下代码到刚创建的UIImageView+ForScrollView.m文件中：
- (void) setAlpha:(float)alpha {
if (self.superview.tag == noDisableVerticalScrollTag) {
if (alpha == && self.autoresizingMask == UIViewAutoresizingFlexibleLeftMargin) {
if (self.frame.size.width < && self.frame.size.height > self.frame.size.width) {
UIScrollView *sc = (UIScrollView*)self.superview;
if (sc.frame.size.height < sc.contentSize.height) {
return;
}
}
}
}
if (self.superview.tag == noDisableHorizontalScrollTag) {
if (alpha == && self.autoresizingMask == UIViewAutoresizingFlexibleTopMargin) {
if (self.frame.size.height < && self.frame.size.height < self.frame.size.width) {
UIScrollView *sc = (UIScrollView*)self.superview;
if (sc.frame.size.width < sc.contentSize.width) {
return;
}
}
}
}
[super setAlpha:alpha];
}
在.pch中定义这两个值：
#define noDisableVerticalScrollTag 836913
#define noDisableHorizontalScrollTag 836914
然后在你所用到UIScrollView、UITableView的视图控制器中：
#import "UIImageView+ForScrollView.h"
设置UIScrollView、UITableView：
UIScrollView *scrollview = [[UIScrollView alloc]initWithFrame:self.view.bounds];
scrollview.contentSize = CGSizeMake(, );
scrollview.tag = noDisableVerticalScrollTag;
[scrollview flashScrollIndicators];
[self.view addSubview:scrollview]; //---
_tableView = [[UITableView alloc]initWithFrame:CGRectMake(, , , )];
_tableView.delegate = self;
_tableView.dataSource = self;
_tableView.showsHorizontalScrollIndicator = YES;
_tableView.tag = noDisableVerticalScrollTag;
[_tableView flashScrollIndicators];
[self.view addSubview:_tableView];
如此即可让UIScrollView、UITableView的滚动条一直显示。