iOS开发技巧 - 使用和定制开关控件(UISwitch)

import UIKit

class ViewController: UIViewController {
// 1. create a property of type UISwitch
var mainSwitch:UISwitch!

override func viewDidLoad() {
super.viewDidLoad()

// 2. create switch
mainSwitch = UISwitch(frame: CGRect(x: 100, y: 100, width: 0, height: 0))
view.addSubview(mainSwitch)
}
}

#import "ViewController.h"

@interface ViewController ()

// 1. create a property of type UISwitch
@property (nonatomic, strong) UISwitch *mainSwitch;

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];

// 2. create switch
self.mainSwitch = [[UISwitch alloc] initWithFrame:
CGRectMake(100, 100, 0, 0)];
[self.view addSubview:self.mainSwitch];
}

@end

mainSwitch.setOn(true, animated: true)

[self.mainSwitch setOn:YES];

if mainSwitch.on{
/* Switch is on */
} else {
/* Switch is off */
}

if ([self.mainSwitch isOn]){
NSLog(@"The switch is on.");
} else {
NSLog(@"The switch is off.");
}

mainSwitch.addTarget(self,
action: "switchIsChanged:",
forControlEvents: .ValueChanged)

func switchIsChanged(sender: UISwitch) {
println("Sender is = \(sender)")
if sender.on{
println("The switch is turned on")
} else {
println("The switch is turned off")
}
}

[self.mainSwitch addTarget:self
action:@selector(switchIsChanged:)
forControlEvents:UIControlEventValueChanged];

- (void) switchIsChanged:(UISwitch *)paramSender {
NSLog(@"Sender is = %@", paramSender);
if ([paramSender isOn]){
NSLog(@"The switch is turned on.");
} else {
NSLog(@"The switch is turned off.");
}
}

/* Adjust the off-mode tint color */
mainSwitch.tintColor = UIColor.redColor()

/* Adjust the on-mode tint color */
mainSwitch.onTintColor = UIColor.brownColor()

/* Also change the knob's tint color */
mainSwitch.thumbTintColor = UIColor.greenColor()