iOS应用中增加emoji表情输入功能

Emoji的介绍参见wiki，iOS支持的emoji表情列表参见
http://pukupi.com/post/1964/,iOS支持的emoji表情的Unicode编码范围为[0xE001,0xE05A]&[0xE101,0xE15A]&[0xE201,0xE253]&[0xE401&0xE44C]&[0xE501,0xE537],Unicode编码转为NSString的方法为[NSStringstringWithFormat:@"%C", i].使用如下代码可以弹出一个可以选择Emoji表情的输入框,

- (void)didSelectAFace:(id)sender{
UIButton *button = (UIButton *)sender;
NSString *emojiStr = [NSString stringWithFormat:@"%C", button.tag];
textView.text = [NSString stringWithFormat:@"%@%@",textView.text,emojiStr];
}

- (void)hideEmojiView{
[emojiView removeFromSuperview];
[emojiCloseButton removeFromSuperview];
}



- (void)showEmojiView{
CGFloat x = (self.view.frame.size.width-300.0f)/2;
CGFloat y = self.view.frame.size.height - 190;
if (emojiView == nil) {
self.emojiView = [[UIView alloc] initWithFrame:CGRectMake(x,y, 300.0f, 140.0f)];
emojiView.backgroundColor = [UIColor lightGrayColor];
emojiView.alpha = 0.8;
emojiView.layer.cornerRadius = 6;
[emojiView.layer setMasksToBounds:YES];

UIScrollView *emojiScrollView = [[UIScrollView alloc] init];
emojiScrollView.frame = CGRectMake(0, 0 ,300.0f, 140.0f);
[emojiView addSubview:emojiScrollView];
int xIndex = 0;
int yIndex = 0;
int emojiRangeArray[10] = {0xE001,0xE05A,0xE101,0xE15A,0xE201,0xE253,0xE401,0xE44C,0xE501,0xE537};
for (int j = 0 ; j<10 ; j+=2 ) {
int startIndex = emojiRangeArray[j];
int endIndex = emojiRangeArray[j+1];
for (int i = startIndex ; i<= endIndex ; i++ ) {
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(6 + xIndex*32, 6 + yIndex*32, 32.0f, 32.0f);

[button setTitle:[NSString stringWithFormat:@"%C", i]forState:UIControlStateNormal];

button.tag = i;

[button addTarget:self action:@selector(didSelectAFace:)forControlEvents:UIControlEventTouchUpInside];

[emojiScrollView addSubview:button];



xIndex += 1;

if (xIndex == 9) {

xIndex = 0;

yIndex += 1;

}

}

}
[emojiScrollView setContentSize:CGSizeMake(300.0f, 12 + (yIndex+1)*32)];



//closeButton

self.emojiCloseButton = [UIButton buttonWithType:UIButtonTypeCustom];

emojiCloseButton.frame = CGRectMake(x-10.0f , y-10.0f , 24.0f, 24.0f);

[emojiCloseButton setImage:[UIImage imageNamed:@"dialog_close.png"]forState:UIControlStateNormal];

[emojiCloseButton addTarget:self action:@selector(hideEmojiView)forControlEvents:UIControlEventTouchUpInside];



}else {

emojiView.frame = CGRectMake(x,y, 300.0f, 140.0f);

emojiCloseButton.frame = CGRectMake(x-10.0f , y-10.0f , 24.0f, 24.0f);

}



[self.view addSubview:emojiView];

[self.view addSubview:emojiCloseButton];



}