自定义UISwitch

ViewController.m

#import "ViewController.h"
#import "MyUISwitch.h"
@interface ViewController ()
            

@end

@implementation ViewController
            
- (void)viewDidLoad {
    [super viewDidLoad];
    
    UISwitch* sw = [[UISwitch alloc]initWithFrame:CGRectMake(200, 100, 0, 0)];
    [self.view addSubview:sw];
    
    MyUISwitch* s = [[MyUISwitch alloc]initWithFrame:CGRectMake(100, 100, 0, 0)];
    [self.view addSubview:s];
    
    
}

MyUISwitch.h

#import <UIKit/UIKit.h>

@interface MyUISwitch : UIControl
@property (nonatomic,assign,getter=isOn) BOOL on;
@end

MyUISwitch.m

#import "MyUISwitch.h"

@implementation MyUISwitch

- (instancetype)init{
    return [self initWithFrame:CGRectZero];
}

- (instancetype)initWithFrame:(CGRect)frame
{
    frame.size.width = 49;
    frame.size.height = 31;
    self = [super initWithFrame:frame];
    if (self) {
        UIView* backView = [[UIView alloc]initWithFrame:self.bounds];
        backView.backgroundColor = [UIColor greenColor];
        backView .tag = 99;
        backView.layer.cornerRadius = 15.5;
        [self addSubview:backView];
        
        CGRect r = self.bounds;
        r.origin.x = .5;
        r.origin.y = .5;
        r.size.height -= 1;
        r.size.width -= .5;
        UIView* offBackView = [[UIView alloc]initWithFrame:r];
        offBackView.backgroundColor = [UIColor whiteColor];
        offBackView.tag = 100;
        offBackView.layer.cornerRadius = 16;
        [self addSubview:offBackView];
        
        UIView* thumb = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 30, 30)];
        thumb.layer.cornerRadius = 15;
        thumb.tag= 101;
        thumb.backgroundColor = [UIColor whiteColor];
        thumb.layer.borderWidth = 0.5;
        thumb.layer.borderColor = [UIColor grayColor].CGColor;
        [self addSubview:thumb];
    }
    return self;
}
-(void)setFrame:(CGRect)frame{
    frame.size.width = 49;
    frame.size.height = 31;
    [super setFrame:frame];
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
     // thumb frame
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
    // UITouch *touch = [touches anyObject];
    // CGPoint p = [touch locationInView:self];
    _on =! _on;
    UIView* thumb = [self viewWithTag:101];
    UIView* back = [self viewWithTag:99];
    UIView* off = [self viewWithTag:100];
    
    [UIView animateWithDuration:.2 animations:^{
    if (_on) {
        thumb.center = CGPointMake(self.frame.size.width-thumb.frame.size.width/2,thumb.center.y);
    }else{
        back.backgroundColor = [UIColor greenColor];
        thumb.center = CGPointMake(thumb.frame.size.width/2, thumb.center.y);
    }}];
    off.hidden= _on;
}

@end