如何把UIView转成UIImage，解决模糊失真问题

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-(UIImage*)convertViewToImage:(UIView*)v{

    CGSize s = v.bounds.size;

    UIGraphicsBeginImageContext(s);

    [v.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage*image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return image;

}

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-(UIImage*)convertViewToImage:(UIView*)v{

    CGSize s = v.bounds.size;

    UIGraphicsBeginImageContextWithOptions(s, NO, v.layer.contentsScale);

    [v.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage*image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return image;

}

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-(UIImage*)convertViewToImage:(UIView*)v{

    CGSize s = v.bounds.size;

    // 下面方法，第一个参数表示区域大小。第二个参数表示是否是非透明的。如果需要显示半透明效果，需要传NO，否则传YES。第三个参数就是屏幕密度了

    UIGraphicsBeginImageContextWithOptions(s, NO, [UIScreen mainScreen].scale);

    [v.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage*image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return image;

}