在iOS8自定义键盘扩展中获取完整字符串 [英] Get full string in iOS8 Custom Keyboard Extension
问题描述
我正在为iOS 8创建自定义键盘扩展。
I'm creating a Custom Keyboard Extension for iOS 8.
我想获取用户在文本输入字段中写入的整个字符串。
I want to get the whole string that the user wrote in the text input field.
不幸的是我遇到了两个主要问题:
Unfortunately I stumble in to two main problems:
1)我在这个回调中得到null:
1) I get null in this callback:
- (void)textDidChange:(id<UITextInput>)textInput
2)我只获得部分字符串当我调用这些方法时:
2) I only get partial String When I call these methods:
- [self.textDocumentProxy documentContextAfterInput];
- [self.textDocumentProxy documentContextBeforeInput];
我想在用户当前正在编辑的文本输入中获取整个字符串
what你建议我这样做吗?
I want to get the whole string in the text input the user is currently editing what do you suggest i do?
谢谢!
推荐答案
我找到了如何。
- (void)doSomething{
dispatch_async(inputQueue, ^{
[self getAllString];
});
return;
}
首先使用dispatch_async和您自己的队列包装您的方法。
First Wrap Your Method With dispatch_async and your own queue.
#define DELAY_LENGTH 0.01
-(void)getAllString{
id<UITextDocumentProxy> proxy = self.textDocumentProxy;
NSString* before = [proxy documentContextBeforeInput];
NSString* after = [proxy documentContextAfterInput];
NSMutableArray* afterArray = [NSMutableArray arrayWithCapacity:10];
while (after) {
unsigned long afterLength = [after length];
if(afterLength <= 0){
break;
}
[afterArray addObject:after];
[NSThread sleepForTimeInterval:DELAY_LENGTH];
[proxy adjustTextPositionByCharacterOffset:afterLength];
[NSThread sleepForTimeInterval:DELAY_LENGTH];
after = [proxy documentContextAfterInput];
}
NSMutableArray* beforeArray = [NSMutableArray arrayWithCapacity:10];
[NSThread sleepForTimeInterval:DELAY_LENGTH];
before = [proxy documentContextBeforeInput];
while (before) {
unsigned long beforeLength = [before length];
if (beforeLength <= 0) {
break;
}
[beforeArray addObject:before];
[NSThread sleepForTimeInterval:DELAY_LENGTH];
[proxy adjustTextPositionByCharacterOffset:-beforeLength];
[NSThread sleepForTimeInterval:DELAY_LENGTH];
before = [proxy documentContextBeforeInput];
}
NSLog(@"afterArray: %@",[self getArrayString:afterArray reverse:false]);
NSString* beforeString = [self getArrayString:beforeArray reverse:true];
NSLog(@"beforArray: %@",beforeString);
[NSThread sleepForTimeInterval:DELAY_LENGTH];
[proxy adjustTextPositionByCharacterOffset:beforeString.length];
}
有两个工具:
@implementation NSArray (Reverse)
- (NSArray *)reversedArray {
NSMutableArray *array = [NSMutableArray arrayWithCapacity:[self count]];
NSEnumerator *enumerator = [self reverseObjectEnumerator];
for (id element in enumerator) {
[array addObject:element];
}
return array;
}
@end
和
-(NSString*)getArrayString : (NSArray*)array
reverse : (BOOL)isReverse{
NSArray* tar = isReverse ? [array reversedArray] : array;
NSMutableString* result = [NSMutableString stringWithCapacity:10];
for (NSString* string in tar) {
[result appendString:string];
}
return result;
}
你必须为每种代理方法小睡一次。
YOU HAVE TO SLEEP LITTLE FOR EACH PROXY METHOD.
结果:
TextBox
012, 345! 6789
0123. 4567! 89012 '34567890.' 123456789
控制台
2015-03-18 21:04:15.034 moveCursor[39413:2692914] afterArray:
2015-03-18 21:04:15.035 moveCursor[39413:2692914] beforArray: 012, 345! 6789
0123. 4567! 89012 '34567890.' 123456789
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