iOS UItextView监听输入特定字符跳转页面选择选项返回

今天有朋友问我一个需求的实现,于是自己写了一个Demo简单的实现了一下:

需求是:

1>比如: 检测用户输入"A"字符串,跳转页面选择选项,将选择的选项放置textView里,作为当前的输入;

2>不是"A"字符,则正常的textView输入;

3.用户跳转选择了,则将选择的输入到textView,否则,还是输入用户输入的字符即可.

实现代码如下:

//
//  ViewController.m
//  Demo
//
//  Created by 思 彭 on 2017/4/30.
//  Copyright © 2017年 思 彭. All rights reserved.
//

#import "ViewController.h"
#import "ViewController1.h"@interface ViewController ()<UITextViewDelegate>@property (nonatomic, strong) UITextView *textView;@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];self.textView = [[UITextView alloc]initWithFrame:CGRectMake(20, 100, self.view.frame.size.width - 40, 200)];self.textView.delegate = self;self.textView.backgroundColor = [UIColor lightGrayColor];[self.view addSubview:self.textView];
}- (BOOL)textViewShouldBeginEditing:(UITextView *)textView {return YES;
}- (BOOL)textViewShouldEndEditing:(UITextView *)textView {return YES;
}- (void)textViewDidBeginEditing:(UITextView *)textView {}
- (void)textViewDidEndEditing:(UITextView *)textView {}- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {NSLog(@"%@",text);__block BOOL isChangeFlag;if ([text isEqualToString:@"A"]) {// 跳转页面ViewController1 *vc1 = [ViewController1 new];vc1.block = ^(NSString *str) {NSLog(@"str = %@",str);NSString *textViewText = textView.text;NSString *s = [textViewText substringWithRange:NSMakeRange(0, textViewText.length)];if (str.length > 0) {isChangeFlag = YES;textView.text = [NSString stringWithFormat:@"%@%@",s, str];} else {isChangeFlag = NO;textView.text = [NSString stringWithFormat:@"%@%@",s, text];}};[self.navigationController pushViewController: vc1 animated:YES];return isChangeFlag;}return YES;
}- (void)textViewDidChange:(UITextView *)textView {}- (void)textViewDidChangeSelection:(UITextView *)textView {}@end

跳转页面选择:

//
//  ViewController1.m
//  Demo
//
//  Created by 思 彭 on 2017/4/30.
//  Copyright © 2017年 思 彭. All rights reserved.
//

#import "ViewController1.h"@interface ViewController1 ()<UITableViewDelegate, UITableViewDataSource>@property (nonatomic, strong) UITableView *tableView;
@property (nonatomic, copy) NSString *selectedStr;@end@implementation ViewController1- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view.self.view.backgroundColor = [UIColor whiteColor];self.selectedStr = @"";[self setUI];
}#pragma mark - 设置界面- (void)setUI {self.tableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height) style:UITableViewStyleGrouped];self.tableView.delegate = self;self.tableView.dataSource = self;self.tableView.backgroundColor = [UIColor clearColor];self.tableView.tableFooterView = [[UIView alloc]init];// 注册cell[self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"];[self.view addSubview: self.tableView];
}#pragma mark - UITableViewDataSource- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {return 1;
}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {return 10;
}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];cell.textLabel.text = [NSString stringWithFormat:@"%ld",indexPath.row];cell.textLabel.font = [UIFont systemFontOfSize:15];return cell;
}#pragma mark - UITableViewDelegate- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {return 0.001f;
}- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section {return 0.0001f;
}- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {NSString *str = [tableView cellForRowAtIndexPath:indexPath].textLabel.text;self.selectedStr = str;if (self.block) {self.block(self.selectedStr);}[self.navigationController popViewControllerAnimated:YES];
}@end