先来看看效果图
实现方法
.h文件
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@property (nonatomic, retain) nsarray *changearray;
@property (nonatomic, retain) nsmutablestring *changestring;
@property (nonatomic, retain) uilabel *codelabel;
-(void)changecode;
@end
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.m文件
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@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
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viewcontroller中调用
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_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];
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手势事件
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- (void)tapclick:(uitapgesturerecognizer*)tap
{
[_codeview changecode];
}
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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。