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##Scenes:
#####1.输入框的键盘消失后,焦点还在。
#####2.输入框的能够显示表情。
#####3.获取输入框的内容时候,表情转换成对应字符串。
#####4.表情输入和系统键盘切换。
##Think:
#####1.默认情况下,系统盘消失后UITextView,UITextField的焦点都会消失,这种情况不像Android开发可以单独呼出键盘和降下键盘,只能选择InputView。
#####2.UITextView添加表情通过NSTextAttachment.image这个属性插入图片。
#####3.显示了表情后,获取带表情内容需要切换成对应字符串,继承NSTextAttachment的子类多定义一个NSString类型emotionStr,在编写一个NSAttributeString的Category进行处理字符转换。
#####4.切换系统键盘和表情键盘通过监听键盘的Show和Hide的通知,将UITextView或UITextField的InputView设置成nil。
#####5.并且使用自定义的UIView作为UITextView,UITextField的inputAccessoryView属性作为切换键盘按钮。
##Step Processes:
#####1.以UITextview为例,在Storyboard设计UI如下图。
#####2.关联自定义UIView作为inputAccessoryView和实例化表情面板
-(void)viewDidLoad {
[super viewDidLoad];
[self.toolBarView removeFromSuperview];//主要因为inputAccessoryView的view不能在storyboard
self.testTv.inputAccessoryView = self.toolBarView;
//isKeyboard = YES;
if ( !faceBoard) {
faceBoard = [[FaceBoard alloc] init];
faceBoard.delegate = self;
f aceBoard.inputTextView = self.testTv;
}
}
#####3.实现系统键盘的表情键盘
-(void)keyboardDidHide:(NSNotification *)notificati {
if (isEmotionShow||isKeyboard) {
[self.testTv becomeFirstResponder];
}
}
-(IBAction)switchBt:(id)sender {
UIButton *button = sender;
if (!isEmotionShow) {
[button setImage:[UIImage imageNamed:@"board_system"] forState:UIControlStateNormal];
isEmotionShow = YES;
isKeyboard = NO;
self.testTv.inputView = faceBoard;
self.testTv resignFirstResponder];
}else{
[button setImage:[UIImage imageNamed:@"board_emoji"] forState:UIControlStateNormal];
isEmotionShow = NO;
isKeyboard = YES;
self.testTv.inputView = nil;
[self.testTv resignFirstResponder];
}
}
#####4.UITextview插入图片
if (self.inputTextView){
NSMutableString *faceString = [[NSMutableString alloc]initWithString:self.inputTextView.text];
[faceString appendString:[_faceMap objectForKey:[NSString stringWithFormat:@"%03d", i]]];
EmotionTextAttachment *emotionTextAttachment = [EmotionTextAttachment new];
emotionTextAttachment.emotionStr = [_faceMap objectForKey:[NSString stringWithFormat:@"%03d", i]];
emotionTextAttachment.image = [UIImage imageNamed:[NSString stringWithFormat:@"%03d", i]];
//存储光标位置
location = (int)self.inputTextView.selectedRange.location;
//插入表情
[self.inputTextView.textStorage insertAttributedString:[NSAttributedString attributedStringWithAttachment:emotionTextAttachment] atIndex:self.inputTextView.selectedRange.location];
//光标位置移动1个单位
self.inputTextView.selectedRange = NSMakeRange(location+1, 0);
[delegate textViewDidChange:self.inputTextView];
}
#####5.编写NSAttributedString的Catergory实现获取表情对应的字符串
@implementation NSAttributedString (Emotion)
-(NSString *) mgo_getPlainString {
NSMutableString *sourceString = [NSMutableString stringWithString:self.string];
__block NSUInteger index = 0;
[self enumerateAttribute:NSAttachmentAttributeName inRange:NSMakeRange(0, self.length) options:0 usingBlock:^(id value, NSRange range, BOOL *stop) {
if (value && [value isKindOfClass:[EmotionTextAttachment class]]) {
[sourceString replaceCharactersInRange:NSMakeRange(range.location + index, range.length) withString:((EmotionTextAttachment *) value).emotionStr];
index += ((EmotionTextAttachment *) value).emotionStr.length - 1;
}
}];
return sourceString;
}
@end
#####6.调用扩展方法
NSString *inputString;
if ( self.inputTextView ) {
inputString = [self.inputTextView.attributedText mgo_getPlainString];
}
