方法很简单：
[UIScreen mainScreen].brightness = 0-1(屏幕亮度范围);
但是对眼睛伤害不利；采用逐渐变亮的方法：
//
// ScreenBrightness.h
// Jump
//
// Created by peter.zhang on 2017/4/24.
// Copyright © 2017年 redstar. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface ScreenBrightness : NSObject
- (void)graduallyResumeBrightness:(CGFloat)brightness;
@end
//
// ScreenBrightness.m
// Jump
//
// Created by peter.zhang on 2017/4/24.
// Copyright © 2017年 redstar. All rights reserved.
//
#import "ScreenBrightness.h"
@interface ScreenBrightness()
@property (nonatomic, strong)NSOperationQueue *queue;
@property (nonatomic, assign)CGFloat currentBrightness;
@end
@implementation ScreenBrightness
- (instancetype)init{
self = [super init];
if (self) {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(saveDefaultBrightness) name:UIScreenBrightnessDidChangeNotification object:nil];
[self saveDefaultBrightness];
}
return self;
}
- (void)graduallySetBrightness:(CGFloat)value{
if (!_queue) {
_queue = [[NSOperationQueue alloc] init];
_queue.maxConcurrentOperationCount = 1;
}
[_queue cancelAllOperations];
CGFloat brightness = [UIScreen mainScreen].brightness;
CGFloat step = 0.005 * ((value > brightness) ? 1 : -1);
int times = fabs((value - brightness) / 0.005);
for (CGFloat i = 1; i < times + 1; i++) {
[_queue addOperationWithBlock:^{
[NSThread sleepForTimeInterval:1 / 180.0];
[UIScreen mainScreen].brightness = brightness + i * step;
}];
}
}
- (void)saveDefaultBrightness{
_currentBrightness = [UIScreen mainScreen].brightness;
}
- (void)graduallyResumeBrightness:(CGFloat)brightness{
[self graduallySetBrightness:brightness];
}
@end