使用 UIImagePicker 调用手机相机拍照或者图库中的照片,UIImageView中显示图片旋转90°或者180°.因为爱疯拍照的照片EXIF 记录含有方向信息(8个方向 imageOrientation).默认的照片方向是横向, Home 键在右侧

EXIF 位置值

引用网友的图片

使用函数   cell.imageView.image = fixOrientation(myPhoto)

func fixOrientation(aImage: UIImage) -> UIImage {

if (aImage.imageOrientation == .Up) {

return aImage

}

var transform = CGAffineTransformIdentity

switch (aImage.imageOrientation) {

case .Down, .DownMirrored:

transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height)

transform = CGAffineTransformRotate(transform, CGFloat(M_PI))

case .Left, .LeftMirrored:

transform = CGAffineTransformTranslate(transform, aImage.size.width, 0)

transform = CGAffineTransformRotate(transform, CGFloat(M_PI_2))

case .Right, .RightMirrored:

transform = CGAffineTransformTranslate(transform, 0, aImage.size.height)

transform = CGAffineTransformRotate(transform, CGFloat(-M_PI_2))

default:

break

}

switch (aImage.imageOrientation) {

case .UpMirrored, .DownMirrored:

transform = CGAffineTransformTranslate(transform, aImage.size.width, 0)

transform = CGAffineTransformScale(transform, -1, 1)

case .LeftMirrored, .RightMirrored:

transform = CGAffineTransformTranslate(transform, aImage.size.height, 0)

transform = CGAffineTransformScale(transform, -1, 1)

default:

break

}

let ctx = CGBitmapContextCreate(nil, Int(aImage.size.width), Int(aImage.size.height),

CGImageGetBitsPerComponent(aImage.CGImage), 0,

CGImageGetColorSpace(aImage.CGImage),

CGImageGetBitmapInfo(aImage.CGImage))

CGContextConcatCTM(ctx, transform)

switch (aImage.imageOrientation) {

case .Left, .LeftMirrored, .Right, .RightMirrored:

CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.height,aImage.size.width), aImage.CGImage)

default:

CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.width,aImage.size.height), aImage.CGImage)

}

// And now we just create a new UIImage from the drawing context

let cgimg = CGBitmapContextCreateImage(ctx)

return UIImage(CGImage: cgimg!)!

}