#import <UIKit/UIKit.h>
NS_ASSUME_NONNULL_BEGIN
@interface IMYAppGrayStyle : NSObject
/// 开启全局变灰
+ (void)open;
/// 关闭全局变灰
+ (void)close;
/// 添加灰色模式
+ (void)addToView:(UIView *)view;
/// 移除灰色模式
+ (void)removeFromView:(UIView *)view;
@end
NS_ASSUME_NONNULL_END
#import "IMYAppGrayStyle.h"
@interface IMYAppGrayStyleCoverView : UIView
@end
@implementation IMYAppGrayStyleCoverView
+ (NSHashTable *)allCoverViews {
static NSHashTable *array;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
array = [NSHashTable weakObjectsHashTable];
});
return array;
}
+ (void)showInMaskerView:(UIView *)maskerView {
if (!@available(iOS 13, *)) {
// iOS13 之前系统不支持
return;
}
// 遍历是否已添加 gray cover view
for (UIView *subview in maskerView.subviews) {
if ([subview isKindOfClass:IMYAppGrayStyleCoverView.class]) {
return;
}
}
IMYAppGrayStyleCoverView *coverView = [[self alloc] initWithFrame:maskerView.bounds];
coverView.userInteractionEnabled = NO;
coverView.backgroundColor = [UIColor lightGrayColor];
coverView.layer.compositingFilter = @"saturationBlendMode";
coverView.layer.zPosition = FLT_MAX;
[maskerView addSubview:coverView];
[self.allCoverViews addObject:coverView];
}
@end
@implementation IMYAppGrayStyle
+ (void)open {
NSAssert(NSThread.isMainThread, @"必须在主线程调用!");
NSMutableSet *windows = [NSMutableSet set];
[windows addObjectsFromArray:UIApplication.sharedApplication.windows];
if (@available(iOS 13, *)) {
for (UIWindowScene *scene in UIApplication.sharedApplication.connectedScenes) {
if (![scene isKindOfClass:UIWindowScene.class]) {
continue;
}
[windows addObjectsFromArray:scene.windows];
}
}
// 遍历所有window，给它们加上蒙版
for (UIWindow *window in windows) {
NSString *className = NSStringFromClass(window.class);
if (![className containsString:@"UIText"]) {
[IMYAppGrayStyleCoverView showInMaskerView:window];
}
}
}
+ (void)close {
NSAssert(NSThread.isMainThread, @"必须在主线程调用!");
for (UIView *coverView in IMYAppGrayStyleCoverView.allCoverViews) {
[coverView removeFromSuperview];
}
}
+ (void)addToView:(UIView *)view {
[IMYAppGrayStyleCoverView showInMaskerView:view];
}
+ (void)removeFromView:(UIView *)view {
for (UIView *subview in view.subviews) {
if ([subview isKindOfClass:IMYAppGrayStyleCoverView.class]) {
[subview removeFromSuperview];
}
}
}
@end
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