iOS数据懒加载和NSUserdefault基本使用

iOS数据懒加载和NSUserdefault基本使用:

#import "ViewController.h"

@interface ViewController ()

@property(nonatomic,strong)UISwitch *mySwitch;

@end

@implementation ViewController

-(UISwitch *)mySwitch

{

    if (_mySwitch==nil) {

        _mySwitch = [[UISwitchalloc]init];

        

        _mySwitch.frame =CGRectMake(100,100, 100,50);

        [self.viewaddSubview:_mySwitch];

    }

    

    return_mySwitch;

}

-(void)clickSwitch

{

    NSLog(@"%d",self.mySwitch.isOn);

    

    NSUserDefaults *udf = [NSUserDefaultsstandardUserDefaults];

    [udf setBool:self.mySwitch.on

          forKey:@"switch"];

    [udf synchronize];

    

}

- (void)viewDidLoad {

    [superviewDidLoad];

    NSUserDefaults *udf = [NSUserDefaultsstandardUserDefaults];

    self.mySwitch.on = [udfboolForKey:@"switch"];

    NSLog(@"----%d",self.mySwitch.on);

    [self.mySwitchaddTarget:selfaction:@selector(clickSwitch)forControlEvents:UIControlEventValueChanged];

    

}