第三方库 KVOController 使用Demo

#import <Foundation/Foundation.h>

@interface CurrentTimer : NSObject

@property (nonatomic, strong) NSDate *date;

@end

#import "CurrentTimer.h"

@implementation CurrentTimer

- (id)init {
self = [super init];

if (self){
[NSTimer scheduledTimerWithTimeInterval:1.0
target:self
selector:@selector(changeTimer:)
userInfo:nil
repeats:YES];
}

return self;
}

- (void)changeTimer:(NSTimer *)timer {
self.date = [NSDate date];
}

@end

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#import <UIKit/UIKit.h>
#import "CurrentTimer.h"

@interface ViewController : UIViewController

@property (strong, nonatomic) IBOutlet UITextField *showDate;

@property (strong, nonatomic) CurrentTimer *timer;

@end

#import <UIKit/UIKit.h>
#import "CurrentTimer.h"

@interface ViewController : UIViewController

@property (strong, nonatomic) IBOutlet UITextField *showDate;

@property (strong, nonatomic) CurrentTimer *timer;

@end

#import "ViewController.h"
#import <FBKVOController.h>

@interface ViewController ()
{
FBKVOController *kvoController;
}
@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];

kvoController = [FBKVOController controllerWithObserver:self];
self.timer = [[CurrentTimer alloc] init];
[kvoController observe:self.timer keyPath:@"date" options:NSKeyValueObservingOptionOld |NSKeyValueObservingOptionNew block:^(ViewController *view, CurrentTimer *timer, NSDictionary *change) {

NSString *dateStr = [NSString stringWithFormat:@"%@", change[NSKeyValueChangeNewKey]];
self.showDate.text = dateStr;
}];
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end

示例效果：



可参考文章： http://www.tuicool.com/articles/7J3Yru