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
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// 保存原来的亮度
[[NSUserDefaults standardUserDefaults] setObject:@([UIScreen mainScreen].brightness) forKey:@ "brightness" ];
// 保存状态,需要为用户变化屏幕亮度功能
[[NSUserDefaults standardUserDefaults] setObject: @YES forKey:@ "ifNeedChangeLight" ];
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2.在viewDidAppear中设置需要的亮度
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- ( void )viewDidAppear:(BOOL)animated
{
[ super viewDidAppear:animated];
if ([UIScreen mainScreen].brightness < 0.8 ) {
[UIScreen mainScreen].brightness = 0.8 ;
}
}
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3.同理viewDidDisappear
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- ( void ):(BOOL)animated
{
[ super viewDidDisappear:animated];
// 还原
[UIScreen mainScreen].brightness = [[[NSUserDefaults standardUserDefaults] objectForKey:@ "brightness" ] floatValue];
[[NSUserDefaults standardUserDefaults] setObject: @NO forKey:@ "ifNeedChangeLight" ];
}
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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
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- ( void )applicationWillResignActive:(UIApplication *)application {
if ([[[NSUserDefaults standardUserDefaults] objectForKey:@ "ifNeedChangeLight" ] boolValue]) {
[UIScreen mainScreen].brightness = [[[NSUserDefaults standardUserDefaults] objectForKey:@ "brightness" ] floatValue];
}
}
- ( void )applicationDidBecomeActive:(UIApplication *)application {
if ([[[NSUserDefaults standardUserDefaults] objectForKey:@ "ifNeedChangeLight" ] boolValue]) {
if ([UIScreen mainScreen].brightness < 0.8 ) {
// 颜色需要渐变的话需要另外再写
[UIScreen mainScreen].brightness = 0.8 ;
}
}
}
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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服务器之家网站的支持!
原文链接:http://blog.csdn.net/yuqingzhude/article/details/54135260