[btn setImage:[UIImage imageWithName:@"paly"] forState:UIControlStateNormal];
[btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
- (void)btnClick:(UIButton *)btn{ if(btn.tag == -1){ [btn setImage:[UIImage imageWithName:@"paly"] forState:UIControlStateNomal];
NSLog(@"开始播放"); btn.tag = 0; }else{ [btn setImage:[UIImage imageWithName:@"pause"] forState:UIControlStateNomal];
NSLog(@"暂停播放"); btn.tag = -1; } }
取出当前软件版本号的方法
//上一次使用软件的版本号 NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; NSString *lastVersion = [deafults stringForKey:@"versionCode"]; //当前软件版本号 NSString *currentVersion = [NSBundle mainBundle].infoDictionary[@"CGBundleVersion"];
//获取版本号后即存入NSUserDefaults
[defaults setObject:currentVersion forKey:@"lastVersion"];
[defaults synchronize];