将NSString变成贝塞尔曲线

将NSString变成贝塞尔曲线

https://github.com/aderussell/string-to-CGPathRef

NSString中的字符串是可以通过CoreText框架将其转换成贝塞尔曲线的.

源码:

//

//  RootViewController.m

//  StringPath

//

//  Copyright (c) 2014年 Y.X. All rights reserved.

//

#import "RootViewController.h"

#import "UIBezierPath+TextPaths.h"

#import "FontPool.h"

#import "YXGCD.h"

@interface RootViewController ()

@property (nonatomic, strong) GCDTimer *timer;

@end

@implementation RootViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    self.view.backgroundColor = [UIColor blackColor];

    // 注册字体

    [FontPool registerFont:bundleFont(@"新蒂小丸子体.ttf")

                  withName:@"新蒂小丸子体"];

    // 获取形状的layer

    CAShapeLayer *line1 = [CAShapeLayer new];

    line1.frame = CGRectMake(, , , );

    line1.fillColor = [UIColor clearColor].CGColor;

    line1.strokeColor = [UIColor blackColor].CGColor;

    line1.strokeStart = .f;

    line1.strokeEnd   = .f;

    line1.lineWidth   = .f;

    // 从string上获取到CGPath

    line1.path = [UIBezierPath pathFromString:@"游贤明"

                                     WithFont:[UIFont fontWithName:CUSTOM_FONT(@"新蒂小丸子体", )

                                                              size:.f]].CGPath;

    // 让文字按照正常的顺序显示

    line1.bounds = CGPathGetBoundingBox(line1.path);

    line1.geometryFlipped = YES;

    // 设置颜色渐变layer

    CAGradientLayer *colorLayer = [CAGradientLayer layer];

    colorLayer.frame = CGRectMake(, , , );

    // 设置遮罩

    colorLayer.mask = line1;

    colorLayer.colors = @[(id)[UIColor redColor].CGColor,

                          (id)[UIColor cyanColor].CGColor];

    colorLayer.position = self.view.center;

    [self.view.layer addSublayer:colorLayer];

    // 动画事件

    _timer = [[GCDTimer alloc] initInQueue:[GCDQueue mainQueue]];

    [_timer event:^{

        line1.strokeEnd = arc4random()%/.f;

        colorLayer.colors = @[(id)[UIColor colorWithRed:arc4random()%/.f

                                                  green:arc4random()%/.f

                                                   blue:arc4random()%/.f

                                                  alpha:].CGColor,

                              (id)[UIColor colorWithRed:arc4random()%/.f

                                                  green:arc4random()%/.f

                                                   blue:arc4random()%/.f

                                                  alpha:].CGColor,

                              (id)[UIColor colorWithRed:arc4random()%/.f

                                                  green:arc4random()%/.f

                                                   blue:arc4random()%/.f

                                                  alpha:].CGColor,

                              (id)[UIColor colorWithRed:arc4random()%/.f

                                                  green:arc4random()%/.f

                                                   blue:arc4random()%/.f

                                                  alpha:].CGColor,

                              (id)[UIColor colorWithRed:arc4random()%/.f

                                                  green:arc4random()%/.f

                                                   blue:arc4random()%/.f

                                                  alpha:].CGColor];

    } timeInterval:NSEC_PER_SEC];

    [_timer start];

}

@end

效果:

核心代码:

附录:

http://stackoverflow.com/questions/7573383/how-to-create-a-multiline-string-or-multiline-label-as-a-cgpath-in-ios