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利用iOS绘制图片生成随机验证码示例代码

2016-11-13 11:50 836 查看

先来看看效果图

实现方法

.h文件

@property (nonatomic, retain) NSArray *changeArray;
@property (nonatomic, retain) NSMutableString *changeString;
@property (nonatomic, retain) UILabel *codeLabel;
-(void)changeCode;
@end

.m文件

@synthesize changeArray = _changeArray;
@synthesize changeString = _changeString;
@synthesize codeLabel = _codeLabel;
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
float red = arc4random() % 100 / 100.0;
float green = arc4random() % 100 / 100.0;
float blue = arc4random() % 100 / 100.0;
UIColor *color = [UIColor colorWithRed:red green:green blue:blue alpha:0.2];
self.backgroundColor = color;
[self change];
}
return self;
}
-(void)changeCode
{
[self change];
[self setNeedsDisplay];
}
- (void)change
{
self.changeArray = [[NSArray alloc] initWithObjects:@"0",@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"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",@"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];
NSMutableString *getStr = [[NSMutableString alloc] initWithCapacity:5];
self.changeString = [[NSMutableString alloc] initWithCapacity:6];
for(NSInteger i = 0; i < 4; i++)
{
NSInteger index = arc4random() % ([self.changeArray count] - 1);
getStr = [self.changeArray objectAtIndex:index];
self.changeString = (NSMutableString *)[self.changeString stringByAppendingString:getStr];
}
}
- (void)drawRect:(CGRect)rect
{
[super drawRect:rect];
float red = arc4random() % 100 / 100.0;
float green = arc4random() % 100 / 100.0;
float blue = arc4random() % 100 / 100.0;
UIColor *color = [UIColor colorWithRed:red green:green blue:blue alpha:0.5];
[self setBackgroundColor:color];
NSString *text = [NSString stringWithFormat:@"%@",self.changeString];
CGSize cSize = [@"S" sizeWithAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:20]}];
int width = rect.size.width / text.length - cSize.width;
int height = rect.size.height - cSize.height;
CGPoint point;
float pX, pY;
for (int i = 0; i < text.length; i++)
{
pX = arc4random() % width + rect.size.width / text.length * i;
pY = arc4random() % height;
point = CGPointMake(pX, pY);
unichar c = [text characterAtIndex:i];
NSString *textC = [NSString stringWithFormat:@"%C", c];
[textC drawAtPoint:point withAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:20]}];
}
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(context, 1.0);
for(int cout = 0; cout < 10; cout++)
{
red = arc4random() % 100 / 100.0;
green = arc4random() % 100 / 100.0;
blue = arc4random() % 100 / 100.0;
color = [UIColor colorWithRed:red green:green blue:blue alpha:0.2];
CGContextSetStrokeColorWithColor(context, [color CGColor]);
pX = arc4random() % (int)rect.size.width;
pY = arc4random() % (int)rect.size.height;
CGContextMoveToPoint(context, pX, pY);
pX = arc4random() % (int)rect.size.width;
pY = arc4random() % (int)rect.size.height;
CGContextAddLineToPoint(context, pX, pY);
CGContextStrokePath(context);
}
}
@end

VIewController中调用

_codeView = [[CodeView alloc] initWithFrame:CGRectMake(15+(SCREEN_WIDTH-30)/3*2, 75, (SCREEN_WIDTH-30)/3, 39)];
//手势
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapClick:)];
[_codeView addGestureRecognizer:tap];
[self.view addSubview: _codeView];

手势事件

- (void)tapClick:(UITapGestureRecognizer*)tap
{
[_codeView changeCode];
}

总结

以上就是利用iOS绘制图片随机验证码的全部内容，希望本文的内容对各位iOS开发者们能有所帮助，如果有疑问大家可以留言交流。

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