ios 圖片剪裁(代碼)

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-(void)viewDidLoad

{  

  UIImage *oldImage = [UIImage imageNamed:@"new"];

  

   UIImage *oldImage = [UIImage imageNamed:@"new"];

   CGFloat centerX = oldImage.size.width/2;

  CGFloat centerY = oldImage.size.height/2;
   
  CGFloat radius = 30;

  //1.建立圖形上下文

   UIGraphicsBeginImageContextWithOptions(oldImage.size, NO, 0.0);

  //2.擷取圖形上下文

   CGContextRef ref =UIGraphicsGetCurrentContext();

  //3.畫一個圓

   CGContextAddArc(ref, centerX, centerY, radius,0, M_PI *2, 0);

  //4.剪下圖片

   CGContextClip(ref);

  //5.擷取當前的圖片

  UIImage *newImage = UIGraphicsGetImageFromCurretImageContext();

  //6.結束圖形上下文

  UIGraphicsEndImageContext();

  //7.擷取資料

  NSData *data  = UIImagePNGRepresentation(newImge);

   [data writeToFile:@"/Users/apple/DeskTop/new1.png" atomically:YES];

  

}

ios 圖片剪裁(代碼)

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