让 UIScrollView 上的滚动条总是可见代码,ObjC代码库,德仔网

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【ObjC】让 UIScrollView 上的滚动条总是可见

作者:万鑫 / 发布于2014/11/15/ 385


	#define noDisableVerticalScrollTag 836913
	#define noDisableHorizontalScrollTag 836914
	
	@implementation UIImageView (ForScrollView)
	
	- (void) setAlpha:(float)alpha {
	
	 if (self.superview.tag == noDisableVerticalScrollTag) {
	 if (alpha == 0 && self.autoresizingMask == UIViewAutoresizingFlexibleLeftMargin) {
	 if (self.frame.size.width < 10 && 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 == 0 && self.autoresizingMask == UIViewAutoresizingFlexibleTopMargin) {
	 if (self.frame.size.height < 10 && 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];
	}
	@end

试试其它关键字

　UIScrollView　　滚动条　　可见　

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