支付宝付款页面调整屏幕亮度

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.

#import <Foundation/Foundation.h>

@interface ScreenBrightness : NSObject

- (void)graduallyResumeBrightness:(CGFloat)brightness;

@end

// ScreenBrightness.m

// Jump

// Created by peter.zhang on 2017/4/24.

#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