IOS程序开发之禁止输入表情符号实例代码

#import <UIKit/UIKit.h>
@interface RootViewController : UIViewController
<UITextViewDelegate>
@end 
RootViewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
//初始化背景
[self addView];
}
#pragma -mark -functions
-(void)addView
{
UITextView *textView=[[UITextView alloc]initWithFrame:CGRectMake(50, 100, 200, 50)];
textView.backgroundColor=[UIColor redColor];
textView.delegate=self;
[self.view addSubview:textView];
}
#pragma -mark -UITextViewDelegate
- (void)textViewDidChange:(UITextView *)textView
{
NSRange textRange = [textView selectedRange];
[textView setText:[self disable_emoji:[textView text]]];
[textView setSelectedRange:textRange];
}
//禁止输入表情
- (NSString *)disable_emoji:(NSString *)text
{
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"[^\u0020-\u007E\u00A0-\u00BE\u2E80-\uA4CF\uF900-\uFAFF\uFE30-\uFE4F\uFF00-\uFFEF\u0080-\u009F\u2000-\u201frn]" options:NSRegularExpressionCaseInsensitive error:nil];
NSString *modifiedString = [regex stringByReplacingMatchesInString:text
options:0
range:NSMakeRange(0, [text length])
withTemplate:@""];
return modifiedString;
}