2021-08-02 1.更新

JLChen

2021-08-02 38f4fb064df09f344fc3237409c76a9fba2a8a9e

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//
//  DCRoundSwitchOutlineLayer.m
//
//  Created by Patrick Richards on 29/06/11.
//  MIT License.
//
//  http://twitter.com/patr
//  http://domesticcat.com.au/projects
//  http://github.com/domesticcatsoftware/DCRoundSwitch
//
 
#import "DCRoundSwitchOutlineLayer.h"
 
@implementation DCRoundSwitchOutlineLayer
 
- (void)drawInContext:(CGContextRef)context
{
    // calculate the outline clip
    CGContextSaveGState(context);
    UIBezierPath *switchOutline = [UIBezierPath bezierPathWithRoundedRect:self.bounds cornerRadius:self.bounds.size.height / 2.0];
    CGContextAddPath(context, switchOutline.CGPath);
    CGContextClip(context);
 
    // inner gloss
    CGContextSaveGState(context);
    CGRect innerGlossPathRect = CGRectMake(self.frame.size.width * 0.05,
                                           self.frame.size.height / 2.0,
                                           self.bounds.size.width  - (self.frame.size.width * 0.1),
                                           self.bounds.size.height / 2.0);
    UIBezierPath *innerGlossPath = [UIBezierPath bezierPathWithRoundedRect:innerGlossPathRect
                                                         byRoundingCorners:UIRectCornerTopLeft | UIRectCornerTopRight
                                                               cornerRadii:CGSizeMake(self.bounds.size.height * 0.3, self.bounds.size.height * 0.3)];
    CGContextAddPath(context, innerGlossPath.CGPath);
    CGContextClip(context);
 
    CGFloat colorStops[2] = {0.0, 1.0};
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    CGFloat innerGlossStartColorComponents[] = {1.0, 1.0, 1.0, 0.14};
    CGFloat innerGlossEndColorComponents[] = {1.0, 1.0, 1.0, 0.50};
    CGColorRef topColor = CGColorCreate(colorSpace, innerGlossStartColorComponents);
    CGColorRef bottomColor = CGColorCreate(colorSpace, innerGlossEndColorComponents);
    CGColorRef colors[] = { topColor, bottomColor };
    CFArrayRef colorsArray = CFArrayCreate(NULL, (const void**)colors, sizeof(colors) / sizeof(CGColorRef), &kCFTypeArrayCallBacks);
    CGGradientRef innerGlossGradient = CGGradientCreateWithColors(colorSpace, colorsArray, colorStops);
    CFRelease(colorsArray);
 
    CGContextDrawLinearGradient(context, innerGlossGradient, CGPointMake(0, CGRectGetMinY(innerGlossPathRect)), CGPointMake(0, CGRectGetMaxY(innerGlossPathRect)), 0);
    CGContextRestoreGState(context);
    CGColorSpaceRelease(colorSpace);
    CGColorRelease(topColor);
    CGColorRelease(bottomColor);
    CGGradientRelease(innerGlossGradient);
 
    // outline and inner shadow
    CGContextSetShadowWithColor(context, CGSizeMake(0.0, 1), 2.0, [UIColor colorWithRed:0.1 green:0.1 blue:0.1 alpha:1.0].CGColor);
    CGContextSetLineWidth(context, 0.5);
    UIBezierPath *outlinePath = [UIBezierPath bezierPathWithRoundedRect:CGRectOffset(self.bounds, -0.5, 0.0) cornerRadius:self.bounds.size.height / 2.0];
    CGContextAddPath(context, outlinePath.CGPath);
    CGContextSetStrokeColorWithColor(context, [UIColor colorWithWhite:0.60 alpha:1.0].CGColor);
    CGContextStrokePath(context);
 
    CGContextAddPath(context, outlinePath.CGPath);
    CGContextStrokePath(context);
}
 
@end