我們做登錄的時(shí)候經(jīng)常會(huì)使用到，驗(yàn)證手機(jī)號(hào)是否正確、向手機(jī)發(fā)送驗(yàn)證碼倒計(jì)時(shí)60s的問(wèn)題，我們改如何解決呢？讓我們一起來(lái)探討一下吧。如下圖：

首先，我們先說(shuō)說(shuō)判斷手機(jī)號(hào)碼是否正確的問(wèn)題吧，我的想法是給字符串添加一個(gè)分類(lèi)，然后寫(xiě)上這樣的代碼：
+ (BOOL)valiMobile:(NSString *)mobile{
        if (mobile.length != 11){
            //判斷手機(jī)號(hào)碼是否為11位
            return NO;
            }else{
                //使用正則表達(dá)式的方法來(lái)判斷手機(jī)號(hào)
/**
* 移動(dòng)號(hào)段正則表達(dá)式
  */
                NSString *CM_NUM = @"^((13[4-9])|(147)|(15[0-2,7-9])|(178)|(18[2-4,7-8]))\\d{8}|(1705)\\d{7}$";
/**
* 聯(lián)通號(hào)段正則表達(dá)式
*/
                 NSString *CU_NUM = @"^((13[0-2])|(145)|(15[5-6])|(176)|(18[5,6]))\\d{8}|(1709)\\d{7}$";
/**
* 電信號(hào)段正則表達(dá)式
*/
                NSString *CT_NUM = @"^((133)|(153)|(177)|(18[0,1,9]))\\d{8}$";
//初始化NSPredicate對(duì)象
                NSPredicate *pred1 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM_NUM];
//與具體對(duì)象進(jìn)行篩選判斷, 返回為BOOL值
                BOOL isMatch1 = [pred1 evaluateWithObject:mobile];
                NSPredicate *pred2 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU_NUM];
                BOOL isMatch2 = [pred2 evaluateWithObject:mobile];
                NSPredicate *pred3 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT_NUM];
            BOOL isMatch3 = [pred3 evaluateWithObject:mobile];
                if (isMatch1 || isMatch2 || isMatch3) {
                    return YES;
                    }else{
                return NO;
            }
        }
}
如果大家對(duì)于NSPredicate的用法有些疑問(wèn)的話可以看看這篇文章：http://www.jianshu.com/p/d4098bc9488d下面再來(lái)說(shuō)一說(shuō)驗(yàn)證碼倒計(jì)時(shí)的問(wèn)題,1、我給button創(chuàng)建了一個(gè)分類(lèi)2、設(shè)定button上的文字，并記錄倒計(jì)時(shí)的總時(shí)長(zhǎng)，然后開(kāi)一個(gè)定時(shí)器，并且關(guān)閉button的點(diǎn)擊事件3、定時(shí)器中將總時(shí)間縮減，并且設(shè)置button的文字，然后做一個(gè)判斷，判斷時(shí)間是否歸為0，如果為0 就釋放定時(shí)器，然后設(shè)置button上的文字，然后打開(kāi)用戶交互。代碼如下：.h文件中
#import@interface UIButton (BtnTime)
/**
按鈕倒計(jì)時(shí)的問(wèn)題
@param countDownTime 倒計(jì)時(shí)的時(shí)間(分鐘)
*/
- (void)buttonWithTime:(CGFloat)countDownTime;
@end
.m文件中
#import "UIButton+BtnTime.h"
/** 倒計(jì)時(shí)的顯示時(shí)間 */
static NSInteger secondsCountDown;
/** 記錄總共的時(shí)間 */
static NSInteger allTime;
@implementation UIButton (BtnTime)
- (void)buttonWithTime:(CGFloat)countDownTime {
self.userInteractionEnabled = NO;
secondsCountDown = 60 * countDownTime;
allTime = 60 * countDownTime;
[self setTitle:[NSString stringWithFormat:@"%lds后重新獲取",secondsCountDown] forState:UIControlStateNormal];
[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timeFireMethod:) userInfo:nil repeats:YES];
}
-(void)timeFireMethod:(NSTimer *)countDownTimer{
//倒計(jì)時(shí)-1
secondsCountDown--;
//修改倒計(jì)時(shí)標(biāo)簽現(xiàn)實(shí)內(nèi)容
[self setTitle:[NSString stringWithFormat:@"%lds后重新獲取",secondsCountDown] forState:UIControlStateNormal];
//當(dāng)?shù)褂?jì)時(shí)到0時(shí)，做需要的操作，比如驗(yàn)證碼過(guò)期不能提交
if(secondsCountDown == 0){
[countDownTimer invalidate];
[self setTitle:@"重新獲取" forState:UIControlStateNormal];
secondsCountDown = allTime;
self.userInteractionEnabled = YES;
}
}
@end

代碼已經(jīng)上傳到github上去了，地址：https://github.com/zhangyqyx/Countdown

作者：誰(shuí)遇而安
鏈接：https://www.jianshu.com/p/d9fbfd8bff75
來(lái)源：簡(jiǎn)書(shū)
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