一. 要求
1.点击获取验证码按钮,60秒倒计时,按钮变成不可点击状态,按钮文字变成倒计时的秒数.
2.当倒计时为0的时候,释放掉定时器NSTimer,按钮变成可以点击状态,按钮文字变成"获取验证码".
二.
// ViewController.m
// Demo-验证码
//
// Created by quhaola on 16/4/11.
// Copyright © 2016年 MC. All rights reserved.
//
#import "ViewController.h"
#import "Masonry.h"
@interface ViewController ()
{
NSTimer *_timer; //定时器
NSInteger _second; //倒计时的时间
}
@property (nonatomic, strong) UITextField * textField;
@property (nonatomic, strong) UIButton * authCodeButton;
@end
@implementation ViewController
#pragma mark - 生命周期
- (void)viewDidLoad
{
[super viewDidLoad];
//创建验证码按钮
[self addAuthCodeButton];
}
#pragma mark - 实现方法
- (void)addAuthCodeButton
{
//输入框
[self.view addSubview:self.textField];
[self.textField mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.equalTo(self.view.mas_left).with.offset(10);
make.top.equalTo(self.view.mas_top).with.offset(100);
make.height.mas_equalTo(40);
make.width.mas_equalTo(200);
}];
//获取验证码按钮
[self.view addSubview:self.authCodeButton];
[self.authCodeButton mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.equalTo(self.textField.mas_right).with.offset(20);
make.right.equalTo(self.view.mas_right).with.offset(-20);
make.top.equalTo(self.view.mas_top).with.offset(100);
make.height.mas_equalTo(40);
}];
}
#pragma mark - 点击事件
//获取验证码按钮的点击事件
- (void)authCodeButtonClicked
{
// 按钮点击之后的操作 ---> 按钮不可点击,按钮背景颜色改变
self.authCodeButton.enabled = NO;
self.authCodeButton.backgroundColor = [UIColor grayColor];
// 设置倒计时的总时间
_second = 10;
// 创建计时器
_timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(changeTime) userInfo:nil repeats:YES];
// (可以不考虑) 把清空textField数据
self.textField.text = nil;
}
#pragma mark 定时器调用的方法
- (void)changeTime
{
//每一秒调用一次改方法, 每次调用,_second 减一.
_second --;
//修改倒计时标签文字 -> 把按钮文字改成倒计时的时间
[self.authCodeButton setTitle:[NSString stringWithFormat:@"%@ s",@(_second)] forState:UIControlStateNormal];
//如果时间到了 0 秒, 把定时器取消掉
if (_second == -1)
{
//释放定时器
[_timer invalidate];
//把定时器设置成空.不然不起作用.
_timer = nil;
//把修改的验证码按钮调整为初始状态
self.authCodeButton.enabled = YES;
[self.authCodeButton setTitle:@"获取验证码" forState:UIControlStateNormal];
self.authCodeButton.backgroundColor = [UIColor orangeColor];
self.textField.text = @"这里是你请求的验证码";
}
}
#pragma mark - 验证码按钮
- (UITextField *)textField
{
if (!_textField)
{
self.textField = [[UITextField alloc] init];
self.textField.backgroundColor = [UIColor colorWithWhite:0.9 alpha:1];
}
return _textField;
}
- (UIButton *)authCodeButton
{
if (!_authCodeButton)
{
self.authCodeButton = [UIButton buttonWithType:UIButtonTypeCustom];
self.authCodeButton.backgroundColor = [UIColor orangeColor];
[self.authCodeButton setTitle:@"获取验证码" forState:UIControlStateNormal];
[self.authCodeButton addTarget:self action:@selector(authCodeButtonClicked) forControlEvents:UIControlEventTouchUpInside];
}
return _authCodeButton;
}
@end