支持辉光效果的Label
效果
源码
https://github.com/YouXianMing/UI-Component-Collection 中的 FBGlowLabel
// // FBGlowLabel.h // // Created by YouXianMing on 16/8/3. // Copyright © 2016年 YouXianMing. All rights reserved. // // https://github.com/lyokato/fbglowlabel // #import <UIKit/UIKit.h> @interface FBGlowLabel : UILabel /** * Glow size, default is 0.f. */ @property (nonatomic) CGFloat glowSize; /** * Glow color, default is clear color. */ @property (nonatomic, strong) UIColor *glowColor; /** * Inner glow size, default is 0.f. */ @property (nonatomic) CGFloat innerGlowSize; /** * Inner glow color, default is clear color. */ @property (nonatomic, strong) UIColor *innerGlowColor; @end
// // FBGlowLabel.m // // Created by YouXianMing on 16/8/3. // Copyright © 2016年 YouXianMing. All rights reserved. // #import "FBGlowLabel.h" @implementation FBGlowLabel - (id)initWithFrame:(CGRect)frame { if (self = [super initWithFrame:frame]) { [self setup]; } return self; } - (id)initWithCoder:(NSCoder *)coder { if (self = [super initWithCoder:coder]) { [self setup]; } return self; } - (void)setup { self.glowSize = 0.0f; self.glowColor = [UIColor clearColor]; self.innerGlowSize = 0.0f; self.innerGlowColor = [UIColor clearColor]; } - (void)drawTextInRectForIOS7:(CGRect)rect { CGContextRef ctx = UIGraphicsGetCurrentContext(); UIGraphicsBeginImageContextWithOptions(rect.size, NO, 0.0); [super drawTextInRect:rect]; UIImage *textImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); CGContextSaveGState(ctx); if (_glowSize > 0) { CGContextSetShadow(ctx, CGSizeZero, _glowSize); CGContextSetShadowWithColor(ctx, CGSizeZero, _glowSize, _glowColor.CGColor); } [textImage drawAtPoint:rect.origin]; CGContextRestoreGState(ctx); if (_innerGlowSize > 0) { UIGraphicsBeginImageContextWithOptions(rect.size, NO, 0.0); CGContextRef ctx2 = UIGraphicsGetCurrentContext(); CGContextSaveGState(ctx2); CGContextSetFillColorWithColor(ctx2, [UIColor blackColor].CGColor); CGContextFillRect(ctx2, rect); CGContextTranslateCTM(ctx2, 0.0, rect.size.height); CGContextScaleCTM(ctx2, 1.0, -1.0); CGContextClipToMask(ctx2, rect, textImage.CGImage); CGContextClearRect(ctx2, rect); CGContextRestoreGState(ctx2); UIImage *inverted = UIGraphicsGetImageFromCurrentImageContext(); CGContextClearRect(ctx2, rect); CGContextSaveGState(ctx2); CGContextSetFillColorWithColor(ctx2, _innerGlowColor.CGColor); CGContextSetShadowWithColor(ctx2, CGSizeZero, _innerGlowSize, _innerGlowColor.CGColor); [inverted drawAtPoint:CGPointZero]; CGContextTranslateCTM(ctx2, 0.0, rect.size.height); CGContextScaleCTM(ctx2, 1.0, -1.0); CGContextClipToMask(ctx2, rect, inverted.CGImage); CGContextClearRect(ctx2, rect); CGContextRestoreGState(ctx2); UIImage *innerShadow = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); [innerShadow drawAtPoint:rect.origin]; } } - (void)drawTextInRectForIOS6:(CGRect)rect { CGContextRef ctx = UIGraphicsGetCurrentContext(); CGContextSaveGState(ctx); if (self.glowSize > 0) { CGContextSetShadow(ctx, CGSizeZero, _glowSize); CGContextSetShadowWithColor(ctx, CGSizeZero, _glowSize, _glowColor.CGColor); } [super drawTextInRect:rect]; CGContextRestoreGState(ctx); if (_innerGlowSize > 0) { UIGraphicsBeginImageContextWithOptions(rect.size, NO, 0.0); CGContextRef ctx2 = UIGraphicsGetCurrentContext(); [super drawTextInRect:rect]; UIImage *textImage = UIGraphicsGetImageFromCurrentImageContext(); CGContextClearRect(ctx2, rect); CGContextSaveGState(ctx2); CGContextSetFillColorWithColor(ctx2, [UIColor blackColor].CGColor); CGContextFillRect(ctx2, rect); CGContextTranslateCTM(ctx2, 0.0, rect.size.height); CGContextScaleCTM(ctx2, 1.0, -1.0); CGContextClipToMask(ctx2, rect, textImage.CGImage); CGContextClearRect(ctx2, rect); CGContextRestoreGState(ctx2); UIImage *inverted = UIGraphicsGetImageFromCurrentImageContext(); CGContextClearRect(ctx2, rect); CGContextSaveGState(ctx2); CGContextSetFillColorWithColor(ctx2, _innerGlowColor.CGColor); CGContextSetShadowWithColor(ctx2, CGSizeZero, _innerGlowSize, _innerGlowColor.CGColor); [inverted drawAtPoint:CGPointZero]; CGContextTranslateCTM(ctx2, 0.0, rect.size.height); CGContextScaleCTM(ctx2, 1.0, -1.0); CGContextClipToMask(ctx2, rect, inverted.CGImage); CGContextClearRect(ctx2, rect); CGContextRestoreGState(ctx2); UIImage *innerShadow = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); [innerShadow drawAtPoint:rect.origin]; } } - (void)drawTextInRect:(CGRect)rect { if (self.text == nil || self.text.length == 0) { return; } if ([[[UIDevice currentDevice] systemVersion] compare:@"7.0" options:NSNumericSearch] != NSOrderedAscending) { [self drawTextInRectForIOS7:rect]; } else { [self drawTextInRectForIOS6:rect]; } } @end
// // ViewController.m // FBGlowLabel // // Created by YouXianMing on 16/8/3. // Copyright © 2016年 YouXianMing. All rights reserved. // #import "ViewController.h" #import "FBGlowLabel.h" @interface ViewController () @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor blackColor]; FBGlowLabel *glowLabel = [[FBGlowLabel alloc] initWithFrame:self.view.bounds]; [self.view addSubview:glowLabel]; glowLabel.text = @"壹擊必殺"; glowLabel.textAlignment = NSTextAlignmentCenter; glowLabel.backgroundColor = [UIColor clearColor]; glowLabel.font = [UIFont fontWithName:@"Heiti SC" size:40.f]; glowLabel.textColor = [[UIColor cyanColor] colorWithAlphaComponent:0.95f]; glowLabel.glowSize = 6; glowLabel.glowColor = [UIColor cyanColor]; glowLabel.innerGlowSize = 3; glowLabel.innerGlowColor = [[UIColor blackColor] colorWithAlphaComponent:0.25f]; } @end