显示键盘时，自定义 UIView 正在向上推部分内容答案

【问题标题】：Custom UIView is Pushing Partial Contents Up When the Keyboard is Shown显示键盘时，自定义 UIView 正在向上推部分内容
【发布时间】：2018-03-08 18:51:34
【问题描述】：

我已经构建了一个自定义 UIView，并将其添加到 UIViewController。

我希望我的自定义 UIView 向上移动以显示键盘隐藏的任何文本字段。但是，它似乎只是将 UIView 的其他元素向上推。

我做错了什么？ 没有键盘：

注意当显示键盘时日期和公司名称是如何被推到UITextFields 后面的

LogInViewController.m

@interface LogInViewController () <UITextFieldDelegate> {
    LoginView * loginView;
}
@property (nonatomic, assign) CGRect   keyboardFrame;
@end

- (void)viewDidLoad {
    [super viewDidLoad];

    loginView = [[LoginView alloc] initWithFrame:self.view.bounds];
    [self.view addSubview:loginView];

    NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
    [nc addObserver:self selector:@selector(handleKeyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
    [nc addObserver:self selector:@selector(handleKeyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}

- (void)handleKeyboardDidShow:(NSNotification *)notification {
    NSTimeInterval animationDuration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue];

    _keyboardFrame = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    _keyboardFrame = [self.view convertRect:_keyboardFrame fromView:self.view.window];

    [UIView animateWithDuration:animationDuration animations:^{
        CGRect frm = loginView.frame;
        frm.size.height = CGRectGetMinY(_keyboardFrame);
        loginView.frame = frm;
    }];
}

- (void)handleKeyboardWillHide:(NSNotification *)notification {
    NSTimeInterval animationDuration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue];

    [UIView animateWithDuration:animationDuration animations:^{
        CGRect frm = loginView.frame;
        frm.size.height = CGRectGetMaxY(self.view.bounds);
        loginView.frame = frm;
    }];
}

LoginView.h

@interface LoginView : UIView
@property (strong, nonatomic) IBOutlet UIView *contentView;
@property (weak, nonatomic) IBOutlet UITextField *txtUsername;
@property (weak, nonatomic) IBOutlet UITextField *txtPassword;
@property (weak, nonatomic) IBOutlet UIActivityIndicatorView *indicator;
@property (weak, nonatomic) IBOutlet UIButton *btnSignin;
@property (weak, nonatomic) IBOutlet UILabel *lblVersion;
@property (weak, nonatomic) IBOutlet UILabel *lblMessageArea;
@end

LoginView.m

@implementation LoginView
- (instancetype) initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if(self){

        [[NSBundle mainBundle] loadNibNamed:NSStringFromClass([self class]) owner:self options:nil];
        [self addSubview:self.contentView];
        self.contentView.frame = self.bounds;
    }
    return self;
}
@end

【问题讨论】：

使用 IQKeyboard 库

标签： ios objective-c uiview uiviewcontroller uikeyboard

【解决方案1】：

你覆盖了_keboardFrame，所以第一个赋值是没用的。

    _keyboardFrame = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    _keyboardFrame = [self.view convertRect:_keyboardFrame fromView:self.view.window];

我建议使用 UIKeyboardWillShowNotification 以获得更一致的动画：

// for your code, I prefer case 1, to shift up the entire view. Anyway, if you want, you can use the second option that I've commented. But the best option is to use constraints, then update that constraint
- (void)keyboardWillShow:(NSNotification *)notification {
    NSTimeInterval animationDuration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue];

    CGFloat keyboardHeight = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue].size.height;

    [UIView animateWithDuration:animationDuration animations:^{
        CGRect frm = loginView.frame;
        // 1. move up the view
        frm.origin.y = -keyboardHeight;
        // 2. change the height
        //frm.size.height = self.view.bounds.size.height - keyboardHeight;
        loginView.frame = frm;
    }];
}

- (void)keyboardWillHide:(NSNotification *)notification {
    NSTimeInterval animationDuration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue];
        [UIView animateWithDuration:animationDuration animations:^{
            loginView.frame = self.view.bounds;
        }];
}

这适合你吗？

【讨论】：