【代码笔记】禁止输入表情符号

一，效果图。

二，工程图。

三，代码。

RootViewController.h

#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-\\u201f\r\n]" options:NSRegularExpressionCaseInsensitive error:nil]; NSString *modifiedString = [regex stringByReplacingMatchesInString:text options:0 range:NSMakeRange(0, [text length]) withTemplate:@""]; return modifiedString; }