最近项目里的登录界面是用Xib拖的。项目很赶没办法。关于验证码遇到的细节上的小问题给大家分享下：
给验证码Button加个边框、并设置边框颜色和宽度实现验证码倒计时操作
一、给验证码Button加个边框、并设置边框颜色和宽度
Paste_Image.png
这块验证码，使用Button拖的，想要实现边框效果，要实现下面两部：
1、在如图位置添加相应属性。这里千万别写错。写错就会没效果，代码如下：
layer.borderWidth Number 1
layer.borderColorWithUIColor Color 自定义的颜色
Paste_Image.png
2、在项目中添加CALayer的Category
CALayer+LayerColor.h
//
// CALayer+LayerColor.h
//
// Created by TL on 2017/4/1.
// Copyright © 2017年 TL. All rights reserved.
//
#import <QuartzCore/QuartzCore.h>
#import <UIKit/UIKit.h>
@interface CALayer (LayerColor)
@end
CALayer+LayerColor.m
//
// CALayer+LayerColor.m
//
// Created by TL on 2017/4/1.
// Copyright © 2017年 TL. All rights reserved.
//
#import "CALayer+LayerColor.h"
@implementation CALayer (LayerColor)
- (void)setBorderColorWithUIColor:(UIColor *)color
{
self.borderColor = color.CGColor;
}
@end
完成这些后，就可以实现验证码Button的边框效果啦。
二、实现验证码倒计时操作
- (IBAction)getVerificationCode:(id)sender {
__block NSInteger time = 59; //倒计时时间
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
dispatch_source_set_timer(_timer,dispatch_walltime(NULL, 0),1.0*NSEC_PER_SEC, 0); //每秒执行
dispatch_source_set_event_handler(_timer, ^{
if(time <= 0){ //倒计时结束，关闭
dispatch_source_cancel(_timer);
dispatch_async(dispatch_get_main_queue(), ^{
//设置按钮的样式
[self.verificationBtn setTitle:@"重新获取" forState:UIControlStateNormal];
[self.verificationBtn setTitleColor:RGBA(188, 188, 188, 1) forState:UIControlStateNormal];//[ColorManager colorWithHexString:@"FB8557"]
self.verificationBtn.userInteractionEnabled = YES;
});
}else{
int seconds = time % 60;
dispatch_async(dispatch_get_main_queue(), ^{
//设置按钮显示读秒效果
[self.verificationBtn setTitle:[NSString stringWithFormat:@"重新获取(%.2d)", seconds] forState:UIControlStateNormal];
[self.verificationBtn setTitleColor:[ColorManager colorWithHexString:@"979797"] forState:UIControlStateNormal];
self.verificationBtn.userInteractionEnabled = NO;
});
time--;
}
});
dispatch_resume(_timer);
}
附赠colorWithHexString颜色方法的实现：
+ (UIColor *)colorWithHexString:(NSString *)stringToConvert
{
NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
if ([cString length] < 6)
return DEFAULT_VOID_COLOR;
if ([cString hasPrefix:@"#"])
cString = [cString substringFromIndex:1];
if ([cString length] != 6)
return DEFAULT_VOID_COLOR;
NSRange range;
range.location = 0;
range.length = 2;
NSString *rString = [cString substringWithRange:range];
range.location = 2;
NSString *gString = [cString substringWithRange:range];
range.location = 4;
NSString *bString = [cString substringWithRange:range];
unsigned int r, g, b;
[[NSScanner scannerWithString:rString] scanHexInt:&r];
[[NSScanner scannerWithString:gString] scanHexInt:&g];
[[NSScanner scannerWithString:bString] scanHexInt:&b];
return [UIColor colorWithRed:((float) r / 255.0f)
green:((float) g / 255.0f)
blue:((float) b / 255.0f)
alpha:1.0f];
}
附赠RGBA颜色方法的实现：
//RGBA
#define RGBA(R/*红*/, G/*绿*/, B/*蓝*/, A/*透明*/) [UIColor colorWithRed:(float)R/255.f green:(float)G/255.f blue:(float)B/255.f alpha:A]
//RGB
#define RGB(r, g, b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1.0]
这时候你的验证码会有 闪烁效果 ，不要怕，改变验证码Button的Type为Custom即可，直接上图：
Paste_Image.png
没有一蹴而就的天才，只有不断点亮天赋的勤者
