前几天写了一个怎么获取app连接,并且通过程序调转到appstrore的文章,但是呢,有很多并不单单的在项目中去跳转,而且还需要生成一个二维码,然后直接去appstore下载,在这里 ,我就来写一下怎么生成二维码,非常简单:
//点击按钮 出现二维码
@interface ViewController ()
@property (nonatomic,strong)UIImageView *QRCodeImgView; //二维码view
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
btn.frame = CGRectMake(20, 50,200, 50);
btn.backgroundColor = [UIColor yellowColor];
[btn setTitle:@"点击出现二维码" forState:UIControlStateNormal];
[btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}
- (void)btnClick:(UIButton *)btn{
btn.enabled = NO;
UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
imgView.center = self.view.center;
imgView.backgroundColor = [UIColor whiteColor];
self.QRCodeImgView = imgView;
[self.view addSubview:imgView];
//获取内置滤镜的种类
NSLog(@"内置滤镜的种类 %@",[CIFilter filterNamesInCategory:kCICategoryBuiltIn]);
CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
//设置默认值
[filter setDefaults];
NSLog(@"inputKey %@",filter.inputKeys);
//封装数据 字符串
[filter setValue:[@"itunes.apple.com/us/app/zhi-fu-bao-rang-sheng-huo/id333206289?mt=8" dataUsingEncoding:NSUTF8StringEncoding] forKey:@"inputMessage"];
//放大原图
CIImage *resultImage = [filter.outputImage imageByApplyingTransform:CGAffineTransformMakeScale(5, 5)];
self.QRCodeImgView.image = [UIImage imageWithCIImage:resultImage];
}
其实这些代码就可以了 还是以上篇文章的支付宝的连接为例子来写的 主要是很多人分不清kCICategoryBuiltIn 的种类那么多 都是什么意思呢 ?那么这里我就跟大家说一些常用的
内置滤镜的种类 (
CIAdditionCompositing, //影像合成\
CICheckerboardGenerator, //棋盘发生器
CIColorBlendMode, //CIColor的混合模式
CIColorBurnBlendMode, //CIColor的燃烧混合模式
CIColorCube, //立方体
CIColorDodgeBlendMode, //CIColor的避免混合模式
CIColorInvert, //CIColor 相反
CIColorMatrix, //CIColor 矩阵
CIColorMonochrome, //黑白照
CIConstantColorGenerator, //恒定颜色发生器
CICrop, //裁剪
CIDarkenBlendMode, //亮度混合模式
CIDifferenceBlendMode, //差分混合模式
CIExclusionBlendMode, //互斥混合模式
CIExposureAdjust, //曝光调节
CIFalseColor, //伪造颜色
CIGammaAdjust, //灰色系数调节
CIGaussianBlur, //高斯模糊效果
CIGaussianGradient, //高斯梯度
CIHardLightBlendMode, //强光混合模式
CIHighlightShadowAdjust, //高亮阴影调节
CIHueAdjust, //饱和度调节
CIHueBlendMode, //饱和度混合模式
CILinearGradient, //线性梯度
CILuminosityBlendMode, //亮度混合模式
CIMaximumCompositing, //最大合成
CIMinimumCompositing, //最小合成
CIMultiplyBlendMode, //多层次混合模式
CIMultiplyCompositing, //多层合成
CIOverlayBlendMode, //覆盖叠加混合模式
CIPhotoEffectTransfer,
CIPinchDistortion,
CIPinLightBlendMode,
CIPixellate,
CIPointillize,
CIQRCodeGenerator,
CIRadialGradient, //半径梯度
CIRandomGenerator,
CIRippleTransition,
CIRowAverage,
CISaturationBlendMode, //饱和度混合模式
CIScreenBlendMode, //全屏混合模式
CISepiaTone, //棕黑色调
CIShadedMaterial,
CISharpenLuminance,
CISixfoldReflectedTile,
CISixfoldRotatedTile,
CISmoothLinearGradient,
CISoftLightBlendMode, //软光混合模式
CISourceAtopCompositing,
CISourceInCompositing,
CISourceOutCompositing,
CISourceOverCompositing,
CISpotColor,
CISpotLight,
CISRGBToneCurveToLinear,
CIStarShineGenerator,
CIStraightenFilter, //拉直过滤器
CIStretchCrop,
CIStripesGenerator, //条纹发生器
CISubtractBlendMode,
CISunbeamsGenerator,
CISwipeTransition,
CITemperatureAndTint, //色温
CIThermal,
CIToneCurve, //色调曲线
CITorusLensDistortion,
CITriangleKaleidoscope,
CITriangleTile,
CITwelvefoldReflectedTile,
CITwirlDistortion,
CIUnsharpMask,
CIVibrance, //震动
CIVignette, //印花
CIVignetteEffect,
CIVortexDistortion,
CIWhitePointAdjust, //白平衡调节
希望通过这篇文章对大家哪怕有那么一点的帮助😊
demo:http://www.jianshu.com/writer#/notebooks/8035700/notes/8516833
