如何让IOS中的文本实现3D效果
                                                    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:
////  UIImage+3D.h////  Created by Lefteris Haritou on 12/10/12.//  Feel Free to use this code, but please keep the credits//#import @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:
////  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        for (int k=0; 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        //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:
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];
图片效果:
                                                    
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