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。。。