#import "AppDelegate.h"
#import "AuthCodeViewController.h"
@interface AppDelegate ()
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
[self.window makeKeyWindow];
self.window.backgroundColor = [UIColor whiteColor];
self.window.rootViewController = [[AuthCodeViewController alloc]init];
return YES;
}
@end
#import@interface AuthcodeView : UIView
@property (strong, nonatomic) NSArray *dataArray;//字符素材数组
@property (strong, nonatomic) NSMutableString *authCodeStr;//验证码字符串
@end
#import "AuthcodeView.h"
#define kRandomColor [UIColor colorWithRed:0.91 green:0.91 blue:0.91 alpha:1.0];
#define kCharCount (arc4random() % 2) + 4
#define kFontSize [UIFont systemFontOfSize:arc4random() % 15 + 15]
@implementation AuthcodeView
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
self.backgroundColor = kRandomColor;
[self getAuthcode];//获得随机验证码
}
return self;
}
#pragma mark 获得随机验证码
- (void)getAuthcode
{
//字符串素材
_dataArray = [[NSArray alloc] initWithObjects:@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",@"i",@"j",@"k",@"l",@"m",@"n",@"o",@"p",@"q",@"r",@"s",@"t",@"u",@"v",@"w",@"x",@"y",@"z",nil];
_authCodeStr = [[NSMutableString alloc] initWithCapacity:kCharCount];
//随机从数组中选取需要个数的字符串，拼接为验证码字符串
for (int i = 0; i < kCharCount; i++)
{
NSInteger index = arc4random() % (_dataArray.count-1);
NSString *tempStr = [_dataArray objectAtIndex:index];
_authCodeStr = (NSMutableString *)[_authCodeStr stringByAppendingString:tempStr];
}
}
#pragma mark 点击界面切换验证码
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[self getAuthcode];
//setNeedsDisplay调用drawRect方法来实现view的绘制
[self setNeedsDisplay];
}
- (void)drawRect:(CGRect)rect
{
[super drawRect:rect];
//设置随机背景颜色
self.backgroundColor = kRandomColor;
//根据要显示的验证码字符串，根据长度，计算每个字符串显示的位置
NSString *text = [NSString stringWithFormat:@"%@",_authCodeStr];
CGSize cSize = [@"A" sizeWithAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:20]}];
int width = rect.size.width/text.length - cSize.width;
int height = rect.size.height - cSize.height;
CGPoint point;
//依次绘制每一个字符,可以设置显示的每个字符的字体大小、颜色、样式等
float pX,pY;