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UIWebView addition to enable/disable scrolling
#import <UIKit/UIKit.h>
@interface UIWebView (Additions)
/*!
@abstract Enable/Disable the receiver from scrolling.
*/
@property (nonatomic, assign) BOOL webViewScrollEnabled;
@end
#import "UIWebView+Additions.h"
@implementation UIWebView (Additions)
- (BOOL)webViewScrollEnabled
{
// iOS 3.2 or above
// - UIWebView has inner UIScrollView
// so we can use it easily
for (id subview in self.subviews) {
if ([subview isKindOfClass: [UIScrollView class]]) {
return ((UIScrollView *)subview).scrollEnabled;
}
}
// iOS 3.1.3 or less
// - UIWebView doesn't contain UIScrollView
// - UIWebView uses custom scroller class
// we can use its method
//
// Customized the way introduced in these page
// http://d.hatena.ne.jp/nakamura001/20090520/1242837408
// http://praveenmatanam.wordpress.com/2009/04/03/how-to-disable-uiwebview-from-user-scrolling/
//
// I'm not sure the name of the getter method, probably which is "isScrollingEnabled" or "scrollingEnabled",
// so I'm trying both of them
//
// WARNING
// Apple will most likely REJECT your app if you try this hack.
// If you dare, you MUST encrypt/hide your selector name before this code and decrypt it in runtime.
// (I do not suggest how to encrypt selector names. Try it on your own risk)
//
SEL selector = @selector(isScrollingEnabled);
for (id subview in self.subviews) {
if ([subview respondsToSelector:selector]) {
NSMethodSignature *sig = [subview methodSignatureForSelector:selector];
NSInvocation* invocation = [NSInvocation invocationWithMethodSignature:sig];
[invocation setTarget:subview];
[invocation setSelector:selector];
[invocation invoke];
BOOL result = YES;
[invocation getReturnValue:&result];
return result;
}
}
selector = @selector(scrollingEnabled);
for (id subview in self.subviews) {
if ([subview respondsToSelector:selector]) {
NSMethodSignature *sig = [subview methodSignatureForSelector:selector];
NSInvocation* invocation = [NSInvocation invocationWithMethodSignature:sig];
[invocation setTarget:subview];
[invocation setSelector:selector];
[invocation invoke];
BOOL result = YES;
[invocation getReturnValue:&result];
return result;
}
}
// Couldn't find the current state. Maybe it's YES (the default)
return YES;
}
- (void)setWebViewScrollEnabled:(BOOL)b
{
// iOS 3.2 or above
// - UIWebView has inner UIScrollView
// so we can use it easily
for (id subview in self.subviews) {
if ([subview isKindOfClass: [UIScrollView class]]) {
((UIScrollView *)subview).scrollEnabled = b;
return;
}
}
// iOS 3.1.3 or less
// - UIWebView doesn't contain UIScrollView
// - UIWebView uses custom scroller class
// we can use its method
//
// Customized the way introduced in these page
// http://d.hatena.ne.jp/nakamura001/20090520/1242837408
// http://praveenmatanam.wordpress.com/2009/04/03/how-to-disable-uiwebview-from-user-scrolling/
//
// WARNING
// Apple will most likely REJECT your app if you try this hack.
// If you dare, you MUST encrypt your selector name before this code and decrypt it in runtime.
// (I do not suggest how to encrypt selector names. Try it on your own risk)
//
SEL selector = @selector(setScrollingEnabled:);
for (id subview in self.subviews) {
if ([subview respondsToSelector:selector]) {
NSMethodSignature *sig = [subview methodSignatureForSelector:selector];
NSInvocation* invocation = [NSInvocation invocationWithMethodSignature:sig];
[invocation setTarget:subview];
[invocation setSelector:selector];
[invocation setArgument:&b atIndex:2];
[invocation invoke];
return;
}
}
}
@end
@newacct
newacct commented Jul 30, 2011

[[subview class] isSubclassOfClass: [UIScrollView class]]
can be written as
[subview isKindOfClass: [UIScrollView class]]

@akisute
Owner
akisute commented Jul 30, 2011

Thanks newacct, you're right and probably that's more easier to understand. I'll fix it up.

@akisute
Owner
akisute commented Jul 30, 2011

Also added some warning comments. I've got my app rejected by using this code ;(

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