一、button扩大点击区域
-(BOOL)pointInside:(CGPoint)point withEvent:(UIEvent*)event
{
CGRect bounds = self.bounds;
//若原热区小于44x44，则放大热区，否则保持原大小不变
CGFloat widthDelta = MAX(44.0 - bounds.size.width,0);
CGFloat heightDelta = MAX(44.0 - bounds.size.height,0);
bounds = CGRectInset(bounds,-0.5 * widthDelta,-0.5 * heightDelta);
return CGRectContainsPoint(bounds,point);
}
二、颜色转图片
+ (UIImage*) getImageWithColor:(UIColor*)color andHeight:(CGFloat)height
{
CGRectr=CGRectMake(0.0f,0.0f,1.0f, height);
UIGraphicsBeginImageContext(r.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, r);
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
returnimg;
}
三、获取视频第一帧图片
+ (UIImage*)getVideoPreViewImage:(NSURL*)path
{
AVURLAsset*asset = [[AVURLAssetalloc]initWithURL:pathoptions:nil];
AVAssetImageGenerator *assetGen = [[AVAssetImageGenerator alloc] initWithAsset:asset];
assetGen.appliesPreferredTrackTransform = YES;
CMTime time = CMTimeMakeWithSeconds(0.0, 600);
NSError*error =nil;
CMTimeactualTime;
CGImageRefimage = [assetGencopyCGImageAtTime:timeactualTime:&actualTimeerror:&error];
UIImage*videoImage = [[UIImagealloc]initWithCGImage:image];
CGImageRelease(image);
returnvideoImage;
}
四、生成二维码图片
+ (UIImage*)createQRImageWithString:(NSString*)string size:(CGSize)size
{
NSData *stringData = [string dataUsingEncoding:NSUTF8StringEncoding];
CIFilter*qrFilter = [CIFilterfilterWithName:@"CIQRCodeGenerator"];
[qrFiltersetValue:stringDataforKey:@"inputMessage"];
[qrFiltersetValue:@"M" forKey:@"inputCorrectionLevel"];
CIImage*qrImage = qrFilter.outputImage;
//放大并绘制二维码 (上面生成的二维码很小，需要放大)
CGImageRefcgImage = [[CIContextcontextWithOptions:nil]createCGImage:qrImagefromRect:qrImage.extent];
UIGraphicsBeginImageContext(size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetInterpolationQuality(context, kCGInterpolationNone);
CGContextScaleCTM(context,1.0, -1.0);
CGContextDrawImage(context, CGContextGetClipBoundingBox(context), cgImage);
UIImage *codeImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CGImageRelease(cgImage);
returncodeImage;
}
