Efekt tekstowy 3D w iOS

Question

Chcę renderować tekst na jednym z moich ekranów, który ma trójwymiarowy wygląd. Używam UIKit i standardowych kontrolerów wyświetleń itd

efekt będzie wyglądać następująco:

można to zrobić jakoś z UIKit & iOS? Zwykle po prostu użyłbym statycznego png, tekst jest dynamiczny i aktualizacje oparte na danych użytkownika

Answer 1

Poniższy kod może nie być idealny, ale powinien być dobrym punktem wyjścia.

Zasadniczo rysujesz czcionkę dwukrotnie, nieznacznie zmieniając rozmiar i przesunięcie. Zależnie od rodzaju czcionki i rozmiaru, z którą masz do czynienia, prawdopodobnie musisz zagrać trochę z fontSize, fontSizeDelta i fontOffset.

Wynik wygląda mniej więcej tak:

- (UIImage *)imageWith3dString:(NSString *)text 
{ 
    CGFloat fontSize = 150.0; 
    CGFloat fontSizeDelta = 3.0; 
    CGFloat fontOffset = 5.0; 

    NSString *fontName = @"Bebas"; 
    UIFont *font = [UIFont fontWithName:fontName size:fontSize]; 
    CGSize textSize = [text sizeWithFont:font 
         constrainedToSize:CGSizeMake(CGFLOAT_MAX, CGFLOAT_MAX)]; 

    CGSize size = CGSizeMake(textSize.width, fontSize); 

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); 
    CGContextRef ctx = CGBitmapContextCreate(NULL, 
              (int)size.width, 
              (int)size.height, 
              8, 
              (int)(4 * size.width), 
              colorSpace, 
              kCGImageAlphaPremultipliedLast); 

    // Draw with shadow 
    CGContextSetShadowWithColor(ctx, CGSizeMake(0, 0), 10.0, [UIColor colorWithWhite:0.0 alpha:0.6].CGColor); 

    CGContextSetRGBStrokeColor(ctx, 1.0, 1.0, 1.0, 0.6); 
    CGContextSetAllowsAntialiasing(ctx, YES); 
    CGContextSetLineWidth(ctx, 2.0); 
    CGContextSetTextDrawingMode(ctx, kCGTextFillStroke); 

    CGContextSetRGBFillColor(ctx, 222/255.0, 222/255.0, 222/255.0, 1.0); 
    CGContextSetCharacterSpacing(ctx, 2.6); 
    CGContextSelectFont(ctx, [fontName UTF8String], fontSize - fontSizeDelta, kCGEncodingMacRoman); 
    CGContextShowTextAtPoint(ctx, 0.0, 3.0 + fontOffset, [text UTF8String], text.length); 

    CGContextSetShadowWithColor(ctx, CGSizeZero, 0.0, NULL); // disable shadow 
    CGContextSetCharacterSpacing(ctx, 1.0); 
    CGContextSelectFont(ctx, [fontName UTF8String], fontSize, kCGEncodingMacRoman); 
    CGContextShowTextAtPoint(ctx, 0.0, 3.0, [text UTF8String], text.length); 


    CGImageRef imageRef = CGBitmapContextCreateImage(ctx); 
    UIImage *image = [UIImage imageWithCGImage:imageRef]; 

    CGColorSpaceRelease(colorSpace); 
    CGImageRelease(imageRef); 
    CGContextRelease(ctx); 

    return image; 
} 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    UIImageView *imageView = [[UIImageView alloc] initWithImage:[self imageWith3dString:@"3"]]; 

    [self.view addSubview:imageView]; 
} 

YMMV

Answer 2

Cóż, tutaj jest podstawową próbkę tego.

Ideą jest ciągłe rysowanie warstw tego samego tekstu za pomocą przesunięcia x/y 1, aby uzyskać wygląd "głębi".

muszę utworzyć kategorię UIImage, zwany UIImage + 3D, które można Test:

To nagłówka (.h) plik

// 
// UIImage+3D.h 
// 
// Created by Lefteris Haritou on 12/10/12. 
// Feel Free to use this code, but please keep the credits 
// 

#import <UIKit/UIKit.h> 

@interface UIImage (Extensions) 

+ (UIImage *)create3DImageWithText:(NSString *)_text Font:(UIFont*)_font ForegroundColor:(UIColor*)_foregroundColor ShadowColor:(UIColor*)_shadowColor outlineColor:(UIColor*)_outlineColor depth:(int)_depth useShine:(BOOL)_shine; 

@end 

Oto realizacja (. m) złożyć

// 
// UIImage+3D.m 
// 
// Created by Lefteris Haritou on 12/10/12. 
// Feel Free to use this code, but please keep the credits 
// 

#import "UIImage+3D.h" 
#import <CoreText/CoreText.h> 
#import <QuartzCore/QuartzCore.h> 

@implementation UIImage (Extensions) 

+ (UIImage *)create3DImageWithText:(NSString *)_text Font:(UIFont*)_font ForegroundColor:(UIColor*)_foregroundColor ShadowColor:(UIColor*)_shadowColor outlineColor:(UIColor*)_outlineColor depth:(int)_depth useShine:(BOOL)_shine { 

    //calculate the size we will need for our text 
    CGSize expectedSize = [_text sizeWithFont:_font constrainedToSize:CGSizeMake(MAXFLOAT, MAXFLOAT)]; 

    //increase our size, as we will draw in 3d, so we need extra space for 3d depth + shadow with blur 
    expectedSize.height+=_depth+5; 
    expectedSize.width+=_depth+5; 

    UIColor *_newColor; 

    UIGraphicsBeginImageContextWithOptions(expectedSize, NO, [[UIScreen mainScreen] scale]); 
    CGContextRef context = UIGraphicsGetCurrentContext(); 

    //because we want to do a 3d depth effect, we are going to slightly decrease the color as we move back 
    //so here we are going to create a color array that we will use with required depth levels 
    NSMutableArray *_colorsArray = [[NSMutableArray alloc] initWithCapacity:_depth]; 

    CGFloat *components = (CGFloat *)CGColorGetComponents(_foregroundColor.CGColor); 

    //add as a first color in our array the original color 
    [_colorsArray insertObject:_foregroundColor atIndex:0]; 

    //create a gradient of our color (darkening in the depth) 
    int _colorStepSize = floor(100/_depth); 

    for (int i=0; i<_depth; i++) { 

     for (int k=0; k<3; k++) { 
      if (components[k]>(_colorStepSize/255.f)) { 
       components[k]-=(_colorStepSize/255.f); 
      } 
     } 
     _newColor = [UIColor colorWithRed:components[0] green:components[1] blue:components[2] alpha:CGColorGetAlpha(_foregroundColor.CGColor)]; 

     //we are inserting always at first index as we want this array of colors to be reversed (darkest color being the last) 
     [_colorsArray insertObject:_newColor atIndex:0]; 
    } 

    //we will draw repeated copies of our text, with the outline color and foreground color, starting from the deepest 
    for (int i=0; i<_depth; i++) { 

     //change color 
     _newColor = (UIColor*)[_colorsArray objectAtIndex:i]; 

     //draw the text 
     CGContextSaveGState(context); 

     CGContextSetShouldAntialias(context, YES); 

     //draw outline if this is the last layer (front one) 
     if (i+1==_depth) { 
      CGContextSetLineWidth(context, 1); 
      CGContextSetLineJoin(context, kCGLineJoinRound); 

      CGContextSetTextDrawingMode(context, kCGTextStroke); 
      [_outlineColor set]; 
      [_text drawAtPoint:CGPointMake(i, i) withFont:_font]; 
     } 

     //draw filling 
     [_newColor set]; 

     CGContextSetTextDrawingMode(context, kCGTextFill); 

     //if this is the last layer (first one we draw), add the drop shadow too and the outline 
     if (i==0) { 
      CGContextSetShadowWithColor(context, CGSizeMake(-2, -2), 4.0f, _shadowColor.CGColor); 
     } 
     else if (i+1!=_depth){ 
      //add glow like blur 
      CGContextSetShadowWithColor(context, CGSizeMake(-1, -1), 3.0f, _newColor.CGColor); 
     } 

     [_text drawAtPoint:CGPointMake(i, i) withFont:_font];   
     CGContextRestoreGState(context); 
    } 

    //if we need to apply the shine 
    if (_shine) { 
     //create an alpha mask from the top most layer of the image, so we can add a shine effect over it 
     CGColorSpaceRef genericRGBColorspace = CGColorSpaceCreateDeviceRGB(); 
     CGContextRef imageContext = CGBitmapContextCreate(NULL, (int)expectedSize.width, (int)expectedSize.height, 8, (int)expectedSize.width * 4, genericRGBColorspace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst); 
     UIGraphicsPushContext(imageContext); 
     CGContextSetTextDrawingMode(imageContext, kCGTextFill); 
     [_text drawAtPoint:CGPointMake(_depth-1, _depth-1) withFont:_font]; 
     CGImageRef alphaMask = CGBitmapContextCreateImage(imageContext); 
     CGContextRelease(imageContext); 
     UIGraphicsPopContext(); 

     //draw shine effect 
     //clip context to the mask we created 
     CGRect drawRect = CGRectZero; 
     drawRect.size = expectedSize; 
     CGContextSaveGState(context); 
     CGContextClipToMask(context, drawRect, alphaMask); 

     CGContextSetBlendMode(context, kCGBlendModeLuminosity); 

     size_t num_locations = 4; 
     CGFloat locations[4] = { 0.0, 0.4, 0.6, 1}; 
     CGFloat gradientComponents[16] = { 
      0.0, 0.0, 0.0, 1.0, 
      0.6, 0.6, 0.6, 1.0, 
      0.8, 0.8, 0.8, 1.0, 
      0.0, 0.0, 0.0, 1.0 
     }; 

     CGGradientRef glossGradient = CGGradientCreateWithColorComponents(genericRGBColorspace, gradientComponents, locations, num_locations); 
     CGPoint start = CGPointMake(0, 0); 
     CGPoint end = CGPointMake(0, expectedSize.height); 
     CGContextDrawLinearGradient(context, glossGradient, start, end, 0); 

     CGColorSpaceRelease(genericRGBColorspace); 
     CGGradientRelease(glossGradient); 
     CGImageRelease(alphaMask); 
     CGContextRestoreGState(context); 
    } 

    UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext(); 
    UIGraphicsEndImageContext(); 
    return finalImage; 
} 


@end 

I korzystać z tego, po prostu importować rozszerzenie kategorii następnie używać go w następujący sposób:

UIImage *my3dImage = [UIImage create3DImageWithText:@"3" Font:[UIFont systemFontOfSize:250] ForegroundColor:[UIColor colorWithRed:(200/255.f) green:(200/255.f) blue:(200/255.f) alpha:1.0] ShadowColor:[UIColor blackColor] outlineColor:[UIColor colorWithRed:(225/255.f) green:(225/255.f) blue:(225/255.f) alpha:1.0] depth:8 useShine:NO]; 
UIImageView *imgView = [[UIImageView alloc] initWithImage:my3dImage]; 
[self.view addSubview: imgView]; 

Innym przykładem jest to:

UIImage *my3dImage = [UIImage create3DImageWithText:@"3D" Font:[UIFont fontWithName:@"MarkerFelt-Wide" size:180] ForegroundColor:[UIColor colorWithRed:(222/255.f) green:(100/255.f) blue:(100/255.f) alpha:1.0] ShadowColor:[UIColor blackColor] outlineColor:[UIColor colorWithRed:(216/255.f) green:(120/255.f) blue:(120/255.f) alpha:1.0] depth:6 useShine:NO]; 
UIImageView *imgView = [[UIImageView alloc] initWithImage:my3dImage]; 
imgView.center = self.view.center; 
[self.view addSubview: imgView]; 

A wynik wygląda tak:

edytowany kod, aby dodać połysk effe ct nad obrazem, który moim zdaniem sprawia, że ​​wygląda chłodnica

UIImage *my3dImage = [UIImage create3DImageWithText:@"3D" Font:[UIFont fontWithName:@"MarkerFelt-Wide" size:180] ForegroundColor:[UIColor colorWithRed:(222/255.f) green:(100/255.f) blue:(100/255.f) alpha:1.0] ShadowColor:[UIColor blackColor] outlineColor:[UIColor colorWithRed:(216/255.f) green:(120/255.f) blue:(120/255.f) alpha:1.0] depth:6 useShine:YES]; 
UIImageView *imgView = [[UIImageView alloc] initWithImage:my3dImage]; 
imgView.center = self.view.center; 
[self.view addSubview: imgView];