問題
近日在寫代碼時,有時候會寫全局的彈出框,我一般是直接把view貼在keywindow上,我發現在keywindow上的視圖中有輸入框的時候,IQKeyboardManager無法自動將這個輸入框彈起。
排查過程
要找這個問題還得看IQKeyboardManager源碼,我發現IQKeyboardManager是根據相應者鏈拿到所屬UIViewController,然后再做之后的操作,如果沒找到,之后的操作都白搭,因為我的view是直接創建好加在了keywindow上,沒有歸于某個UIViewController,所以就會出現無效的問題。
查找解決辦法
于是呼我去百度了一番,沒找到解決方案。
我又找到了IQKeyboardManager的github,查看issue,發現果然有人更我有同樣的困惑,并且開發者回復的是
This library don't support textFields that are directly added to a UIWindow, it must come throught UIViewController or one of it's subclass.
此庫不支持直接添加到uiwindow的文本字段,它必須通過uiviewcontroller或其子類之一。
issue截圖
WTF!開發者直接就說不適配加在keywindow上的輸入框。
解決辦法
萬萬沒想到,最終我還是解決了這個問題。
我模仿IQKeyboardManager,自己實現了一個支持keywindow的KeyboardManager,思路是這樣的:
- 創建一個單例。
- 重寫
+ (void)load;
方法,模仿IQKeyboardManager的拖進項目就生效功能。 - 監聽keyboard的彈出通知和UITextField的開始結束編輯通知。
- [主要操作]在開始編輯時用響應者鏈查找UIViewController如果有的話不處理,正常的還是交給IQKeyboardManager處理吧,畢竟人家是專業的。每找到一個UIView就做記錄,直到找到UIWindow,這時候我就記錄了uiview之前響應者鏈中的最后一個view,然后在鍵盤彈起時如果鍵盤高度高于textfield就將這個找到的view向上提起一部分,我用的是CGAffineTransform做的移動,因為方便恢復,恢復的話只需要把view的transform設置為CGAffineTransformIdentity就可以復原了。
上代碼
下面代碼是整個manager的.m代碼,只是實現了一個簡單的UITextfield上提功能
#import "WZZKeyboardManager.h"
WZZKeyboardManager * wzzKeyboardManager;
@interface WZZKeyboardManager ()
@property (assign, nonatomic) CGRect keyboardFrame;
@property (weak, nonatomic) UITextField * nowTF;
@end
@implementation WZZKeyboardManager
+ (void)load {
[self shareInstance];
}
+ (instancetype)shareInstance {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
wzzKeyboardManager = [[WZZKeyboardManager alloc] init];
[wzzKeyboardManager setup];
});
return wzzKeyboardManager;
}
- (void)setup {
[[NSNotificationCenter defaultCenter] addObserver:wzzKeyboardManager selector:@selector(KeyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:wzzKeyboardManager selector:@selector(KeyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:wzzKeyboardManager selector:@selector(TextFieldTextDidBeginEditing:) name:UITextFieldTextDidBeginEditingNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:wzzKeyboardManager selector:@selector(TextFieldTextDidEndEditing:) name:UITextFieldTextDidEndEditingNotification object:nil];
}
- (void)KeyboardWillShow:(NSNotification *)noti {
NSValue * vv = noti.userInfo[UIKeyboardFrameEndUserInfoKey];
self.keyboardFrame = [vv CGRectValue];
UITextField * tf = self.nowTF;
UIView * view = [self getViewOnWindow:tf];
if (view) {
CGRect fr = [tf.superview convertRect:tf.frame toView:[UIApplication sharedApplication].keyWindow];
CGRect fr2 = [view.superview convertRect:view.frame toView:[UIApplication sharedApplication].keyWindow];
CGFloat y = CGRectGetMaxY(fr);
CGFloat y2 = self.keyboardFrame.origin.y;
CGFloat y3 = y2-y-8;
if (y3 < 0) {
//tf提起
[UIView animateWithDuration:0.25f animations:^{
view.transform = CGAffineTransformMakeTranslation(fr2.origin.x, fr2.origin.y+y3);
}];
}
}
}
- (void)KeyboardWillHide:(NSNotification *)noti {
// NSLog(@"wzz%@", noti.userInfo);
}
- (void)TextFieldTextDidBeginEditing:(NSNotification *)noti {
UITextField * tf = noti.object;
self.nowTF = tf;
}
- (void)TextFieldTextDidEndEditing:(NSNotification *)noti {
UITextField * tf = noti.object;
UIView * view = [self getViewOnWindow:tf];
if (view) {
[UIView animateWithDuration:0.25f animations:^{
view.transform = CGAffineTransformIdentity;
}];
}
}
- (UIView *)getViewOnWindow:(UIView *)view {
UIResponder *nextResponder = view;
while (![nextResponder isKindOfClass:[UIWindow class]]) {
nextResponder = [nextResponder nextResponder];
if (!nextResponder) {
return nil;
}
if ([nextResponder isKindOfClass:[UIViewController class]]) {
return nil;
}
if (![nextResponder isKindOfClass:[UIWindow class]] && [nextResponder isKindOfClass:[UIView class]]) {
view = (UIView *)nextResponder;
}
}
return view;
}
@end
代碼地址
看到有些小伙伴可能看長篇大論有點煩,直接附一個代碼地址,我做了一個demo,WZZKeyboardManager
文件夾直接拉到自己項目里就行
詳情請見:項目下載地址