首先为我糟糕的英语感到抱歉!!
在我的应用程序中有一个 UIViewController 并且 UIView 在 subViewLogin 中被称为 subViewLogin 有 2 个 UITextField 被称为用户名和密码。当我的应用程序运行时 subViewLogin 被 UIViewAnimationCurveLinear 移动到位置。但是当我完成编辑 UITextField(调用 resignFirstResponder)时 subViewLogin 卷土重来定位。为什么?我怎样才能防止 subViewLogin 重新定位?
这是我的代码。
//LoginViewController.h
#import <UIKit/UIKit.h>
@interface LoginViewController : UIViewController
@property (weak, nonatomic) IBOutlet UITextField *username;
@property (weak, nonatomic) IBOutlet UITextField *password;
@property (weak, nonatomic) IBOutlet UIImageView *background;
@property (weak, nonatomic) IBOutlet UIImageView *logoEnergy;
@property (weak, nonatomic) IBOutlet UIImageView *logoKmutl;
@property (weak, nonatomic) IBOutlet UIImageView *logoProjectname;
@property (weak, nonatomic) IBOutlet UIView *subviewLogin;
- (void)advoidSubviewFromKeyboard;
- (IBAction)usernameAndPasswordBeginEdit;
- (IBAction)dismissKeyboard;
@end
和
//LoginViewController.m
#import "LoginViewController.h"
@implementation LoginViewController
const float keyBoardPortraitHeight = 216;
const float keyBoardLandscapeHeight = 162;
@synthesize username, password, background, logoEnergy, logoKmutl, logoProjectname;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:@"background.png"]];
UIView *subview = self.subviewLogin;
subview.frame = CGRectMake(subview.frame.origin.x, self.view.frame.size.height, subview.frame.size.width, subview.frame.size.height);
}
- (void)viewDidAppear:(BOOL)animated
{
[UIView
animateWithDuration:0.3
delay: 0.0
options: UIViewAnimationCurveLinear
animations:^{
UIView *subview = self.subviewLogin;
subview.frame = CGRectMake(subview.frame.origin.x, self.view.frame.size.height-subview.frame.size.height-30, subview.frame.size.width, subview.frame.size.height);
}
completion:^(BOOL finished){
}
];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)advoidSubviewFromKeyboard
{
[UIView
animateWithDuration:0.3
delay: 0.0
options: UIViewAnimationCurveLinear
animations:^{
self.view.frame = CGRectMake(self.view.frame.origin.x, -keyBoardPortraitHeight+30, self.view.frame.size.width, self.view.frame.size.height);
}
completion:^(BOOL finished){
}
];
}
- (IBAction)usernameAndPasswordBeginEdit
{
[self advoidSubviewFromKeyboard];
}
- (IBAction)dismissKeyboard
{
NSLog(@"dismiss");
//[self.username becomeFirstResponder];
//[self.username resignFirstResponder];
[self.subviewLogin endEditing:YES];
//[self.view endEditing:YES];
}
@end
最佳答案
即使很久以前就提出了这个问题,但这种行为现在仍然存在。我已经使用约束而不是更新元素的框架来解决它。示例:
func expand(with view: UIView, constraint: NSLayoutConstraint) {
constraint.constant = self.isExpanded ? self.minHeight : self.maxHeight //set needed constant here
UIView.animate(withDuration: expandDuration, animations: {
self.arrowImageView.transform = self.isExpanded ? .identity : CGAffineTransform(rotationAngle: self.topAngle)
view.layoutSubviews() //layout constraint's view subviews
}) { _ in
self.isExpanded = !self.isExpanded
}
}
关于ios resignFirstResponder 重置动画,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14091683/