IOS 仿支付宝支付屏幕亮度变化机制
1.首先,在需要实现的界面viewDidLoad中先保存亮度没有变化之前的亮度,因为这个界面消失之后还要变回原来的亮度,变化亮度也相当于用户的一种设置,所以也要保存一下这个状态,因为之后当APP在active和非active切换时候需要知道是否需要为用户做这个功能
//保存原来的亮度 [[NSUserDefaultsstandardUserDefaults]setObject:@([UIScreenmainScreen].brightness)forKey:@"brightness"]; //保存状态,需要为用户变化屏幕亮度功能 [[NSUserDefaultsstandardUserDefaults]setObject:@YESforKey:@"ifNeedChangeLight"];
2.在viewDidAppear中设置需要的亮度
-(void)viewDidAppear:(BOOL)animated { [superviewDidAppear:animated]; if([UIScreenmainScreen].brightness<0.8){ [UIScreenmainScreen].brightness=0.8; } }
3.同理viewDidDisappear
-(void):(BOOL)animated { [superviewDidDisappear:animated]; //还原 [UIScreenmainScreen].brightness=[[[NSUserDefaultsstandardUserDefaults]objectForKey:@"brightness"]floatValue]; [[NSUserDefaultsstandardUserDefaults]setObject:@NOforKey:@"ifNeedChangeLight"]; }
4.当从底部滑起操作栏和退出app到主界面需要进行恢复和设置相应操作
-(void)applicationWillResignActive:(UIApplication*)application{ if([[[NSUserDefaultsstandardUserDefaults]objectForKey:@"ifNeedChangeLight"]boolValue]){ [UIScreenmainScreen].brightness=[[[NSUserDefaultsstandardUserDefaults]objectForKey:@"brightness"]floatValue]; } } -(void)applicationDidBecomeActive:(UIApplication*)application{ if([[[NSUserDefaultsstandardUserDefaults]objectForKey:@"ifNeedChangeLight"]boolValue]){ if([UIScreenmainScreen].brightness<0.8){ //颜色需要渐变的话需要另外再写 [UIScreenmainScreen].brightness=0.8; } } }
5.如果需要亮度渐变效果网上有实现的函数,设置亮度直接调函数就可以了
以上所述是小编给大家介绍的IOS仿支付宝支付屏幕亮度变化机制,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对毛票票网站的支持!