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如何让IOS中的文本实现3D效果

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zhedianshi 级别: 帮帮团发帖487云币430 加关注写私信	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：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、码农成长日记分享到淘江湖新浪QQ微博QQ空间开心人人豆瓣网易微博百度鲜果白社会飞信回复引用举报

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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：
复制代码

//

// 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;

@end

.m文件：

复制代码

//

// 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"

@implementation UIImage (Extensions)

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

//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);

}

UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return finalImage;

}

@end

导入category扩展然后如下使用：

复制代码

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];

UIImageView *imgView = [[UIImageView alloc] initWithImage:my3dImage];

[self.view addSubview: imgView];

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