如何让IOS中的文本实现3D效果

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 如何让IOS中的文本实现3D效果
 
 

如何让IOS中的文本实现3D效果

级别: 帮帮团如何让IOS中的文本实现3D效果
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只看楼主 更多操作楼主  发表于: 2014-06-10
 
 
 
我想要在IOS中对一些文本进行3D效果渲染,使用了UIKit和标准视图控制器。 
实现之的效果大概能成为这样: 
如何让IOS中的文本实现3D效果 
 
能不能通过iOS和UIKit实现?我只用了一个静态PNG图片,文本内容根据用户数据变化。
 
 
 
关键词: ios开发 3D效果

第46期:北京云栖大会、钉钉、快速黑洞、码农成长日记

 
 
 

如何让IOS中的文本实现3D效果

级别: 小白如何让IOS中的文本实现3D效果
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只看该作者沙发  发表于: 2014-06-10
Re如何让IOS中的文本实现3D效果
 
 
提供一个方法,不断的重复画文本的layer,创建有层次的效果: 
创建UIImage Category,命名为UIImage+3d.h文件:
  1. //
  2. //  UIImage+3D.h
  3. //
  4. //  Created by Lefteris Haritou on 12/10/12.
  5. //  Feel Free to use this code, but please keep the credits
  6. //
  7. #import <UIKit/UIKit.h>
  8. @interface UIImage (Extensions)
  9. + (UIImage *)create3DImageWithText:(NSString *)_text Font:(UIFont*)_font ForegroundColor:(UIColor*)_foregroundColor ShadowColor:(UIColor*)_shadowColor outlineColor:(UIColor*)_outlineColor depth:(int)_depth;
  10. @end

.m文件:

  1. //
  2. //  UIImage+3D.m
  3. //
  4. //  Created by Lefteris Haritou on 12/10/12.
  5. //  Feel Free to use this code, but please keep the credits
  6. //
  7. #import "UIImage+3D.h"
  8. @implementation UIImage (Extensions)
  9. + (UIImage *)create3DImageWithText:(NSString *)_text Font:(UIFont*)_font ForegroundColor:(UIColor*)_foregroundColor ShadowColor:(UIColor*)_shadowColor outlineColor:(UIColor*)_outlineColor depth:(int)_depth {
  10. //calculate the size we will need for our text
  11. CGSize expectedSize = [_text sizeWithFont:_font constrainedToSize:CGSizeMake(MAXFLOAT, MAXFLOAT)];
  12. //increase our size, as we will draw in 3d, so we need extra space for 3d depth + shadow with blur
  13. expectedSize.height+=_depth+5;
  14. expectedSize.width+=_depth+5;
  15. UIColor *_newColor;
  16. UIGraphicsBeginImageContextWithOptions(expectedSize, NO, [[UIScreen mainScreen] scale]);
  17. CGContextRef context = UIGraphicsGetCurrentContext();
  18. //because we want to do a 3d depth effect, we are going to slightly decrease the color as we move back
  19. //so here we are going to create a color array that we will use with required depth levels
  20. NSMutableArray *_colorsArray = [[NSMutableArray alloc] initWithCapacity:_depth];
  21. CGFloat *components =  (CGFloat *)CGColorGetComponents(_foregroundColor.CGColor);
  22. //add as a first color in our array the original color
  23. [_colorsArray insertObject:_foregroundColor atIndex:0];
  24. //create a gradient of our color (darkening in the depth)
  25. int _colorStepSize = floor(100/_depth);
  26. for (int i=0; i<_depth; i++) {
  27. for (int k=0; k<3; k++) {
  28. if (components[k]>(_colorStepSize/255.f)) {
  29. components[k]-=(_colorStepSize/255.f);
  30. }
  31. }
  32. _newColor = [UIColor colorWithRed:components[0] green:components[1] blue:components[2] alpha:CGColorGetAlpha(_foregroundColor.CGColor)];
  33. //we are inserting always at first index as we want this array of colors to be reversed (darkest color being the last)
  34. [_colorsArray insertObject:_newColor atIndex:0];
  35. }
  36. //we will draw repeated copies of our text, with the outline color and foreground color, starting from the deepest
  37. for (int i=0; i<_depth; i++) {
  38. //change color
  39. _newColor = (UIColor*)[_colorsArray objectAtIndex:i];
  40. //draw the text
  41. CGContextSaveGState(context);
  42. CGContextSetShouldAntialias(context, YES);
  43. //draw outline if this is the last layer (front one)
  44. if (i+1==_depth) {
  45. CGContextSetLineWidth(context, 1);
  46. CGContextSetLineJoin(context, kCGLineJoinRound);
  47. CGContextSetTextDrawingMode(context, kCGTextStroke);
  48. [_outlineColor set];
  49. [_text drawAtPoint:CGPointMake(i, i) withFont:_font];
  50. }
  51. //draw filling
  52. [_newColor set];
  53. CGContextSetTextDrawingMode(context, kCGTextFill);
  54. //if this is the last layer (first one we draw), add the drop shadow too and the outline
  55. if (i==0) {
  56. CGContextSetShadowWithColor(context, CGSizeMake(-2, -2), 4.0f, _shadowColor.CGColor);
  57. }
  58. else if (i+1!=_depth){
  59. //add glow like blur
  60. CGContextSetShadowWithColor(context, CGSizeMake(-1, -1), 3.0f, _newColor.CGColor);
  61. }
  62. [_text drawAtPoint:CGPointMake(i, i) withFont:_font];
  63. CGContextRestoreGState(context);
  64. }
  65. UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
  66. UIGraphicsEndImageContext();
  67. return finalImage;
  68. }
  69. @end

导入category扩展然后如下使用:

  1. 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];
  2. UIImageView *imgView = [[UIImageView alloc] initWithImage:my3dImage];
  3. [self.view addSubview: imgView];