iOS 输入中文自动补英文bug

** Bug 原因：**
UITextField、UITextView 使用了 ReactiveObjC、ReactiveCocoa 的 rac_textSignal 方法导致

** 解决办法： **
给UITextField、UITextView 添加分类代替 ReactiveObjC、ReactiveCocoa 的 rac_textSignal 方法：
** UITextField 分类：**

#import "UITextField+Add.h"
#import "NSObject+RACDescription.h"

- (RACSignal *)rac_inputTextSignal {

    @weakify(self);
    return [[[[[[RACSignal
                defer:^{
                    @strongify(self);
                    return [RACSignal return:self];
                }]
               concat:[self rac_signalForControlEvents:UIControlEventAllEditingEvents]]
              filter:^BOOL(UITextField *x) {
                  if (!x.markedTextRange) {
                      return YES;
                  } else {
                      return NO;
                  }
              }]
              map:^(UITextField *x) {
                  return x.text;
              }]
             takeUntil:self.rac_willDeallocSignal]
            setNameWithFormat:@"%@ -rac_inputTextSignal", RACDescription(self)];
}

@end

** UITextView 分类：**

#import "UITextView+Add.h"
#import "NSObject+RACDescription.h"

@implementation UITextView (Add)

static void RACUseDelegateProxy_(UITextView *self) {

    if (self.delegate == (id)self.rac_delegateProxy) return;
    
    self.rac_delegateProxy.rac_proxiedDelegate = self.delegate;
    self.delegate = (id)self.rac_delegateProxy;
}

- (RACSignal *)rac_inputTextSignal {

    @weakify(self);
    RACSignal *signal = [[[[[[[RACSignal
                             defer:^{
                                 @strongify(self);
                                 return [RACSignal return:RACTuplePack(self)];
                             }]
                            concat:[self.rac_delegateProxy signalForSelector:@selector(textViewDidChange:)]]
                            reduceEach:^(UITextView *x) {
                                return x;
                            }]
                           filter:^BOOL(UITextView *x) {
                               if (!x.markedTextRange) {
                                   return YES;
                               } else {
                                   return NO;
                               }
                           }]
                           map:^(UITextView *x) {
                               return x.text;
                           }]
                          takeUntil:self.rac_willDeallocSignal]
                         setNameWithFormat:@"%@ -rac_inputTextSignal", RACDescription(self)];
    RACUseDelegateProxy_(self);
    return signal;
}

@end

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