ios – 当焦点从UITextField和UIWebView更改时,如何避免键盘隐藏和显示？

UIWebView GUIFixes.h

#import <UIKit/UIKit.h>

@interface UIWebView (GUIFixes)

/**
 *  @brief      The custom input accessory view.
 */
@property (nonatomic,strong,readwrite) UIView* customInputAccessoryView;

/**
 *  @brief      Wether the UIWebView will use the fixes provided by this category or not.
 */
@property (nonatomic,assign,readwrite) BOOL usesGUIFixes;

@end

UIWebView GUIFixes.m

#import "UIWebView+GUIFixes.h"
#import <objc/runtime.h>

@implementation UIWebView (GUIFixes)

static const char* const kCustomInputAccessoryView = "kCustomInputAccessoryView";
static const char* const fixedClassName = "UIWebbrowserViewMinusAccessoryView";
static Class fixClass = Nil;

- (UIView *)browserView
{
    UIScrollView *scrollView = self.scrollView;

    UIView *browserView = nil;
    for (UIView *subview in scrollView.subviews) {
        if ([NsstringFromClass([subview class]) hasPrefix:@"UIWebbrowserView"]) {
            browserView = subview;
            break;
        }
    }

    return browserView;
}

- (id)methodReturningCustomInputAccessoryView
{
    UIView* view = [self performSelector:@selector(originalInputAccessoryView) withObject:nil];

    if (view) {

        UIView* parentWebView = self.superview;

        while (parentWebView && ![parentWebView isKindOfClass:[UIWebView class]])
        {
            parentWebView = parentWebView.superview;
        }

        UIView* customInputAccessoryView = [(UIWebView*)parentWebView customInputAccessoryView];

        if (customInputAccessoryView) {
            view = customInputAccessoryView;
        }
    }

    return view;
}

- (BOOL)delayedBecomeFirstResponder
{
    dispatch_after(dispatch_time(disPATCH_TIME_Now,(int64_t)(0.01 * NSEC_PER_SEC)),dispatch_get_main_queue(),^{
        [super becomeFirstResponder];
    });

    return YES;
}

- (void)ensureFixedSubclassExistsOfbrowserViewClass:(Class)browserViewClass
{
    if (!fixClass) {
        Class newClass = objc_allocateClasspair(browserViewClass,fixedClassName,0);
        IMP oldImp = class_getmethodImplementation(browserViewClass,@selector(inputAccessoryView));
        class_addMethod(newClass,@selector(originalInputAccessoryView),oldImp,"@@:");

        IMP newImp = [self methodForSelector:@selector(methodReturningCustomInputAccessoryView)];
        class_addMethod(newClass,@selector(inputAccessoryView),newImp,"@@:");
        objc_registerClasspair(newClass);

        IMP delayedFirstResponderImp = [self methodForSelector:@selector(delayedBecomeFirstResponder)];
        Method becomeFirstResponderMethod = class_getInstanceMethod(browserViewClass,@selector(becomeFirstResponder));
        method_setImplementation(becomeFirstResponderMethod,delayedFirstResponderImp);

        fixClass = newClass;
    }
}

- (BOOL)usesGUIFixes
{
    UIView *browserView = [self browserView];
    return [browserView class] == fixClass;
}

- (void)setUsesGUIFixes:(BOOL)value
{
    UIView *browserView = [self browserView];
    if (browserView == nil) {
        return;
    }

    [self ensureFixedSubclassExistsOfbrowserViewClass:[browserView class]];

    if (value) {
        object_setClass(browserView,fixClass);
    }
    else {
        Class normalClass = objc_getClass("UIWebbrowserView");
        object_setClass(browserView,normalClass);
    }

    [browserView reloadInputViews];
}

- (UIView*)customInputAccessoryView
{
    return objc_getAssociatedobject(self,kCustomInputAccessoryView);
}

- (void)setCustomInputAccessoryView:(UIView*)view
{
    objc_setAssociatedobject(self,kCustomInputAccessoryView,view,OBJC_ASSOCIATION_RETAIN);
}

@end