Rendering any UIViews into UIImage in one line Raw => From jamztang (https://gist.github.com/jamztang/1578446)

UIView-ViewToImage.h

//
//Reference link : https://gist.github.com/jamztang/1578446
//
#import <UIKit/UIKit.h>

@interface UIView (ViewToImage)

// - [UIImage toImage]
//
// Follow device screen scaling. If your view is sized 320 * 480, 
// it renders 320 * 480 on non-retina display devices, 
// and 640 * 960 on retina display devices
// Use this option for making high resolution view elements snapshots to display on retina devices
- (UIImage *)toImage;

// - [UIImage toImageWithScale]
//
// Force rendering in a given scale. Commonly used will be "1".
// Good for output or saving a static image with the exact size of the view element.
- (UIImage *)toImageWithScale:(CGFloat)scale;

// - [UIImage toImageWithScale:legacy:]
//
// Set legacy to YES to force use the old API instead of
// iOS 7's drawViewHierarchyInRect:afterScreenUpdates: API
- (UIImage *)toImageWithScale:(CGFloat)scale legacy:(BOOL)legacy;

@end

UIView-ViewToImage.m

#import "UIView-ViewToImage.h"
#import <QuartzCore/QuartzCore.h>

@implementation UIView (ViewToImage)

static BOOL _supportDrawViewHierarchyInRect;

+ (void)load {
    if ([self instancesRespondToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)]) {
        _supportDrawViewHierarchyInRect = YES;
    } else {
        _supportDrawViewHierarchyInRect = NO;
    }
}

- (UIImage *)toImage {
    return [self toImageWithScale:0];
}

- (UIImage *)toImageWithScale:(CGFloat)scale {
    UIImage *copied = [self toImageWithScale:scale legacy:NO];
    return copied;
}

- (UIImage *)toImageWithScale:(CGFloat)scale legacy:(BOOL)legacy {
    // If scale is 0, it'll follows the screen scale for creating the bounds
    UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, scale);
    
    if (legacy || ! _supportDrawViewHierarchyInRect) {
        // - [CALayer renderInContext:] also renders subviews
        [self.layer renderInContext:UIGraphicsGetCurrentContext()];
    } else {
        [self drawViewHierarchyInRect:self.bounds
                   afterScreenUpdates:YES];
    }
    
    // Get the image out of the context
    UIImage *copied = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    // Return the result
    return copied;
}

@end