067改变UISwitch文本和颜色（扩展知识：更好的自定义做法是用继承UISlider实现，这里未做）

1 #import <UIKit/UIKit.h>
2 
3 @interface ViewController : UIViewController
4 @end

 1 #import "ViewController.h"
 2 #import "KMSwitch.h"
 3 
 4 @interface ViewController ()
 5 - (void)layoutUI;
 6 @end
 7 
 8 @implementation ViewController
 9 
10 - (void)viewDidLoad {
11     [super viewDidLoad];
12     
13     [self layoutUI];
14 }
15 
16 - (void)didReceiveMemoryWarning {
17     [super didReceiveMemoryWarning];
18     // Dispose of any resources that can be recreated.
19 }
20 
21 - (void)layoutUI {
22     //自定义开关1
23     KMSwitch *swtCustom = [[KMSwitch alloc] initWithFrame:CGRectZero];
24     CGPoint newPoint = self.view.center;
25     swtCustom.center = newPoint;
26     [swtCustom setLeftLabelText:@"否"
27                           color:[UIColor grayColor]
28                            font:[UIFont boldSystemFontOfSize:14.0f]];
29     [swtCustom setRightLabelText:@"是"
30                           color:[UIColor whiteColor]
31                            font:[UIFont boldSystemFontOfSize:14.0f]];
32     [self.view addSubview:swtCustom];
33     
34     //自定义开关2
35     swtCustom = [[KMSwitch alloc] initWithFrame:CGRectZero];
36     newPoint.y += 40;
37     swtCustom.center = newPoint;
38     [swtCustom setLeftLabelText:@"N"
39                           color:[UIColor redColor]
40                            font:[UIFont boldSystemFontOfSize:15.0f]];
41     [swtCustom setRightLabelText:@"Y"
42                            color:[UIColor blueColor]
43                             font:[UIFont boldSystemFontOfSize:15.0f]];
44     [self.view addSubview:swtCustom];
45 }
46 
47 @end

 1 #import <UIKit/UIKit.h>
 2 
 3 @interface UISwitch (extended)
 4 - (void)setAlternateColors:(BOOL)boolean;
 5 @end
 6 
 7 @interface KMSwitch : UISwitch
 8 - (void)setLeftLabelText:(NSString *)labelText color:(UIColor *)labelColor font:(UIFont *)labelFont;
 9 - (void)setRightLabelText:(NSString *)labelText color:(UIColor *)labelColor font:(UIFont *)labelFont;
10 
11 @end

 1 #import "KMSwitch.h"
 2 
 3 @interface KMSwitch ()
 4 - (UILabel *)createLabelWithText:(NSString *)labelText color:(UIColor *)labelColor font:(UIFont *)labelFont rect:(CGRect)rect;
 5 @end
 6 
 7 @implementation KMSwitch
 8 
 9 - (UIView *)slider {
10     return [[self subviews] lastObject];
11 }
12 
13 - (UIView *)textHolder {
14     return [[self slider] subviews][2];
15 }
16 
17 - (UIImageView *)leftView {
18     return [[self textHolder] subviews][0];
19 }
20 
21 - (UIImageView *)rightView {
22     return [[self textHolder] subviews][1];
23 }
24 
25 - (void)setLeftLabelText:(NSString *)labelText color:(UIColor *)labelColor font:(UIFont *)labelFont {
26     UIImageView *imgVLeft = [self leftView];
27     imgVLeft.image = nil;
28     imgVLeft.frame = CGRectMake(0, 0, 0, 0);
29     [imgVLeft addSubview:[self createLabelWithText:labelText
30                                              color:labelColor
31                                               font:labelFont
32                                               rect:CGRectMake(28, 5, 20, 20)]];
33 }
34 
35 - (void)setRightLabelText:(NSString *)labelText color:(UIColor *)labelColor font:(UIFont *)labelFont {
36     UIImageView *imgVRight = [self rightView];
37     imgVRight.image = nil;
38     imgVRight.frame = CGRectMake(0, 0, 0, 0);
39     [imgVRight addSubview:[self createLabelWithText:labelText
40                                               color:labelColor
41                                                font:labelFont
42                                                rect:CGRectMake(3, 5, 20, 20)]];
43 }
44 
45 - (UILabel *)createLabelWithText:(NSString *)labelText color:(UIColor *)labelColor font:(UIFont *)labelFont rect:(CGRect)rect {
46     UILabel *lbl = [[UILabel alloc] initWithFrame:rect];
47     lbl.text = labelText;
48     lbl.textColor = labelColor;
49     lbl.font = labelFont;
50     lbl.textAlignment = NSTextAlignmentCenter;
51     lbl.backgroundColor = [UIColor clearColor];
52     return lbl;
53 }
54 
55 @end