创建一个测试的UIButton#import "ViewController.h"@interface ViewController ()@property(nonatomic, strong)UIButton *button;@end@implementat ...
创建一个测试的UIButton
#import "ViewController.h"@interface ViewController ()@property(nonatomic, strong)UIButton *button;@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; self.button = [[UIButton alloc] initWithFrame:CGRectMake(30, 50, 50, 30)]; [self.button setTitle:@"测试" forState:UIControlStateNormal]; [self.button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; self.button.layer.borderWidth = 1.0f; [self.view addSubview:self.button]; //注册监听button的enabled状态 [self.button addObserver:self forKeyPath:@"enabled" options:NSKeyValueObservingOptionNew context:@"test_button"]; // 3秒钟后改变当前button的enabled状态 dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3.0f * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ self.button.enabled = YES; });}
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原标题：iOS 监听控件某个属性的改变observeValueForKeyPath
关键词：IOS
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