一、第一种创建UISwitch组件的方法,在代码中动态创建。
1、打开Xcode, 新建项目Switch,选择Single View Application。
2、打开ViewController.m文件在viewDidLoad方法里添加代码:
(void)viewDidLoad { [super viewDidLoad]; UISwitch *switchButton = [[UISwitch alloc] initWithFrame:CGRectMake(50, 100, 20, 10)]; [switchButton setOn:YES]; [switchButton addTarget:self action:@selector(switchAction:) forControlEvents:UIControlEventValueChanged]; [self.view addSubview:switchButton];// Do any additional setup after loading the view, typically from a nib. } [switchButton addTarget:selfaction:@selector(switchAction:)forControlEvents:UIControlEventValueChanged];
记得把switchButton加到当前view,调用[self.viewaddSubview:switchButton];
3、监听UISwitch按下事件
实现代码如下:
(void)switchAction:(id)sender { UISwitch *switchButton = (UISwitch*)sender; BOOL isButtonOn = [switchButton isOn]; if (isButtonOn) { showSwitchValue.text = @"是"; }else { showSwitchValue.text = @"否"; } }
运行,效果:
二、通过拖拽方法使用UISwitch
1、往xib文件上拖拽一个UISwitch控件。
2、按alt+command + return键开启Assistant Editor模式,选中UISwitch控件,按住Control键,往ViewController.h拖拽
3、选Action方式
4、.m文件中实现switchAction 。刚才动态创建的时候也用到这个方法名称,可以先注释掉刚才的。
(IBAction)switchAction:(id)sender { UISwitch *switchButton = (UISwitch*)sender; BOOL isButtonOn = [switchButton isOn]; if (isButtonOn) { showSwitchValue.text = @"是"; }else { showSwitchValue.text = @"否"; } }
三、自定义UISwitch
1.使用类别扩展UISwitch。
如下:
下面是UISwitch.h文件:
#import@interface UISwitch (tagged) + (UISwitch *) switchWithLeftText: (NSString *) tag1 andRight: (NSString *) tag2; @property (nonatomic, readonly) UILabel *label1; @property (nonatomic, readonly) UILabel *label2; @end
#import "UISwitch-Extended.h"#define TAG_OFFSET 900
@implementation UISwitch (tagged) - (void) spelunkAndTag: (UIView *) aView withCount:(int *) count { for (UIView *subview in [aView subviews]) { if ([subview isKindOfClass:[UILabel class]]) { *count += 1; [subview setTag:(TAG_OFFSET + *count)]; } else [self spelunkAndTag:subview withCount:count]; } }
- (UILabel *) label1 { return (UILabel *) [self viewWithTag:TAG_OFFSET + 1]; }
- (UILabel *) label2 { return (UILabel *) [self viewWithTag:TAG_OFFSET + 2]; }
+ (UISwitch *) switchWithLeftText: (NSString *) tag1 andRight: (NSString *) tag2 { UISwitch *switchView = [[UISwitch alloc] initWithFrame:CGRectZero];
int labelCount = 0; [switchView spelunkAndTag:switchView withCount:&labelCount];
if (labelCount == 2) { [switchView.label1 setText:tag1]; [switchView.label2 setText:tag2]; }
return [switchView autorelease]; }
@end
UISwitch *isFooOrBar=[[UISwitch alloc] init];((UILabel )[[[[[[isFooOrBar subviews] lastObject] subviews] objectAtIndex:2] subviews]objectAtIndex:0]).text = @"Foo"; ((UILabel *)[[[[[[isFooOrBar subviews] lastObject] subviews] objectAtIndex:2] subviews]objectAtIndex:1]).text = @"Bar";*
BOOL setting = switchView.isOn; NSLog(@"%d",setting);
[switchView setOn:setting animated:YES];
switchView.onTintColor = [UIColor orangeColor];
switchView.thumbTintColor = [UIColor redColor];
switchView.tintColor = [UIColor purpleColor];
[switchView addTarget:self action:@selector(switchAction:) forControlEvents:UIControlEventValueChanged];
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