iOS中按比例剪切图片的方法

//iOS中按比例剪切图片的方法

UIImage *icon = [UIImage imageNamed:model.singerHeaderName];

//裁剪的尺寸大小

CGSize itemSize = CGSizeMake(70, 70);

UIGraphicsBeginImageContextWithOptions(itemSize, NO,0.0);

CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);

[icon drawInRect:imageRect];

cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();