130 строки
3.4 KiB
Objective-C
130 строки
3.4 KiB
Objective-C
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#import "RCTSafeAreaView.h"
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#import <React/RCTBridge.h>
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#import <React/RCTUIManager.h>
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#import "RCTSafeAreaViewLocalData.h"
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@implementation RCTSafeAreaView {
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__weak RCTBridge *_bridge;
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UIEdgeInsets _currentSafeAreaInsets;
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}
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- (instancetype)initWithBridge:(RCTBridge *)bridge
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{
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if (self = [super initWithFrame:CGRectZero]) {
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_bridge = bridge;
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_emulateUnlessSupported = YES; // The default.
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}
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return self;
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}
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RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)decoder)
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RCT_NOT_IMPLEMENTED(- (instancetype)initWithFrame:(CGRect)frame)
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- (BOOL)isSupportedByOS
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{
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return [self respondsToSelector:@selector(safeAreaInsets)];
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}
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- (UIEdgeInsets)safeAreaInsetsIfSupportedAndEnabled
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{
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#if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 110000 /* __IPHONE_11_0 */
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if (self.isSupportedByOS) {
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if (@available(iOS 11.0, *)) {
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return self.safeAreaInsets;
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}
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}
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#endif
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return self.emulateUnlessSupported ? self.emulatedSafeAreaInsets : UIEdgeInsetsZero;
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}
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- (UIEdgeInsets)emulatedSafeAreaInsets
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{
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UIViewController* vc = self.reactViewController;
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if (!vc) {
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return UIEdgeInsetsZero;
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}
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CGFloat topLayoutOffset = vc.topLayoutGuide.length;
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CGFloat bottomLayoutOffset = vc.bottomLayoutGuide.length;
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CGRect safeArea = vc.view.bounds;
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safeArea.origin.y += topLayoutOffset;
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safeArea.size.height -= topLayoutOffset + bottomLayoutOffset;
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CGRect localSafeArea = [vc.view convertRect:safeArea toView:self];
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UIEdgeInsets safeAreaInsets = UIEdgeInsetsMake(0, 0, 0, 0);
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if (CGRectGetMinY(localSafeArea) > CGRectGetMinY(self.bounds)) {
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safeAreaInsets.top = CGRectGetMinY(localSafeArea) - CGRectGetMinY(self.bounds);
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}
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if (CGRectGetMaxY(localSafeArea) < CGRectGetMaxY(self.bounds)) {
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safeAreaInsets.bottom = CGRectGetMaxY(self.bounds) - CGRectGetMaxY(localSafeArea);
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}
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return safeAreaInsets;
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}
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static BOOL UIEdgeInsetsEqualToEdgeInsetsWithThreshold(UIEdgeInsets insets1, UIEdgeInsets insets2, CGFloat threshold) {
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return
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ABS(insets1.left - insets2.left) <= threshold &&
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ABS(insets1.right - insets2.right) <= threshold &&
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ABS(insets1.top - insets2.top) <= threshold &&
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ABS(insets1.bottom - insets2.bottom) <= threshold;
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}
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- (void)safeAreaInsetsDidChange
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{
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[self invalidateSafeAreaInsets];
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}
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- (void)invalidateSafeAreaInsets
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{
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[self setSafeAreaInsets:self.safeAreaInsetsIfSupportedAndEnabled];
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}
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- (void)layoutSubviews
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{
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[super layoutSubviews];
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if (!self.isSupportedByOS && self.emulateUnlessSupported) {
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[self invalidateSafeAreaInsets];
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}
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}
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- (void)setSafeAreaInsets:(UIEdgeInsets)safeAreaInsets
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{
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if (UIEdgeInsetsEqualToEdgeInsetsWithThreshold(safeAreaInsets, _currentSafeAreaInsets, 1.0 / RCTScreenScale())) {
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return;
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}
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_currentSafeAreaInsets = safeAreaInsets;
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RCTSafeAreaViewLocalData *localData = [[RCTSafeAreaViewLocalData alloc] initWithInsets:safeAreaInsets];
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[_bridge.uiManager setLocalData:localData forView:self];
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}
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- (void)setEmulateUnlessSupported:(BOOL)emulateUnlessSupported
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{
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if (_emulateUnlessSupported == emulateUnlessSupported) {
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return;
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}
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_emulateUnlessSupported = emulateUnlessSupported;
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if ([self isSupportedByOS]) {
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return;
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}
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[self invalidateSafeAreaInsets];
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}
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@end
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