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限制输入长度的问题，在这里完美的解决了！
//先创建一个textField 和 一个button。
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#import "ViewController.h"@interface ViewController ()<UITextFieldDelegate> { UITextField *currentTextFeild; UIButton *touchButton;}@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. UITextField *textFields = [[UITextField alloc] initWithFrame:CGRectMake(15, 50, self.view.bounds.size.width-15*2, 40)]; textFields.backgroundColor = [UIColor brownColor]; textFields.layer.cornerRadius = 5; textFields.leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 40)]; textFields.leftViewMode = UITextFieldViewModeAlways;//这两行是为了不让Text太贴textField的左边 textFields.placeholder = @"请输入手机号"; textFields.delegate = self; [self.view addSubview:textFields]; currentTextFeild = textFields; UIButton *enableButton = [UIButton buttonWithType:UIButtonTypeCustom]; enableButton.frame = CGRectMake(15, 100, self.view.bounds.size.width-15*2, 40); enableButton.layer.cornerRadius = 5; enableButton.backgroundColor = [UIColor grayColor]; [enableButton setTitle:@"没内容不可点击" forState:UIControlStateNormal]; [enableButton setTitle:@"可以按了" forState:UIControlStateSelected]; [enableButton setTitle:@"按下去了" forState:UIControlStateHighlighted]; enableButton.enabled = NO; [enableButton addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:enableButton]; touchButton = enableButton;}- (void)btnClick { } |
//设置textField代理
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#pragma mark - UITextFieldDelegate- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField { return YES;}- (void)textFieldDidEndEditing:(UITextField *)textField { }- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { //用来判断是否可以继续输入， - range.length是为了判断是否可以删除 NSInteger currentLength = textField.text.length - range.length + string.length; if (currentLength > 11) { return NO; } //判断按钮是否可以enable = YES if (currentTextFeild.text && currentTextFeild.text.length > 0 && currentLength > 0) { touchButton.enabled = YES; touchButton.selected = YES; }else { touchButton.enabled = NO; touchButton.selected = NO; } if (currentLength <= 0) { touchButton.enabled = NO; touchButton.selected = NO; } return YES;}- (BOOL)textFieldShouldClear:(UITextField *)textField { if (currentTextFeild.tag == 11 || currentTextFeild.tag == 12) { //手机号 touchButton.enabled = NO; touchButton.selected = NO;; } return YES;}- (BOOL)textFieldShouldReturn:(UITextField *)textField { [textField resignFirstResponder]; return YES;} |
只要有基础的，差不多都能看明白。。。
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原文地址：http://www.cnblogs.com/jiafuyang/p/4829120.html
