我正在实施UIAlertController，如下所示：
-(void)createAlert{
UIAlertController * alert= [UIAlertController
alertControllerWithTitle:@"Ошибка электронного адреса"
message:@"Ваш электронный адрес должен содержать символ @ и название домена"
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction* yesButton = [UIAlertAction
actionWithTitle:@"Сейчас исправлю"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
//Handel your yes please button action here
[alert dismissViewControllerAnimated:YES completion:nil];
}];
[alert addAction:yesButton];
[self presentViewController:alert animated:YES completion:nil];
}
然而，它仅显示一小部分秒（约0.5秒）的警报。我怎么能解决这个问题，所以只有在用户按“是”按钮后它才会解除？
更新 - 根据需要提供完整的实施代码：
#define RGB(r, g, b) \
[UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1]
#define RGBA(r, g, b, a) \
[UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:(a)]
//cell.textColor = RGB(0x66, 0x33, 0x33);
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UILabel *enterLoginLabel;
@property (weak, nonatomic) IBOutlet UILabel *enterEmailTextLabel;
@property (weak, nonatomic) IBOutlet UILabel *confirmEmailTextLabel;
@property (weak, nonatomic) IBOutlet UIButton *maleButton;
@property (weak, nonatomic) IBOutlet UIButton *femaleButton;
@property (weak, nonatomic) IBOutlet UITextField *loginTextField;
@property (weak, nonatomic) IBOutlet UITextField *emailTextField;
@property (weak, nonatomic) IBOutlet UITextField *emailConfirmTextField;
@end
@implementation ViewController {
BOOL isMale;
BOOL isFemale;
BOOL isStartTyping;
BOOL loginIsMoved;
BOOL emailIsMoved;
BOOL emailConfirmIsMoved;
int currentIndex;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self setColors];
[self addTargets];
}
#pragma mark - gender check
- (IBAction)maleButtonTapped:(id)sender {
if (!isMale && !isFemale){
[UIView animateWithDuration:2.0 animations:^{
self.maleButton.backgroundColor = RGB(0x63, 0xB8, 0xFF);
} completion:NULL];
isMale = YES;
}
if (isFemale && !isMale){
[UIView animateWithDuration:2.0 animations:^{
self.femaleButton.backgroundColor = RGB(0xC1, 0xCD, 0xCD);
} completion:NULL];
isFemale = NO;
[UIView animateWithDuration:2.0 animations:^{
self.maleButton.backgroundColor = RGB(0x63, 0xB8, 0xFF);
} completion:NULL];
isMale = YES;
}
}
- (IBAction)femaleButtonTapped:(id)sender {
if (!isMale && !isFemale){
[UIView animateWithDuration:2.0 animations:^{
self.femaleButton.backgroundColor = RGB(0xFF, 0x83, 0xFA);
} completion:NULL];
isFemale = YES;
}
if (isMale && !isFemale){
[UIView animateWithDuration:2.0 animations:^{
self.maleButton.backgroundColor = RGB(0xC1, 0xCD, 0xCD);
} completion:NULL];
isMale = NO;
[UIView animateWithDuration:2.0 animations:^{
self.femaleButton.backgroundColor = RGB(0xFF, 0x83, 0xFA);
} completion:NULL];
isFemale = YES;
}
}
#pragma mark - color
-(void)setColors{
self.view.backgroundColor = RGB(0xF0, 0xE6, 0x8c);
self.maleButton.backgroundColor = RGB(0xC1, 0xCD, 0xCD);
self.femaleButton.backgroundColor = RGB(0xC1, 0xCD, 0xCD);
}
#pragma mark - UITextFieldDelegate
-(void)textFieldDidBeginEditing:(UITextField *)textField
{
if (textField == self.loginTextField){
NSLog(@"login text field");
currentIndex = 1;
}
if (textField == self.emailTextField){
NSLog(@"Email text field");
currentIndex = 2;
}
if (textField == self.emailConfirmTextField){
NSLog(@"Confirm email text field");
currentIndex = 3;
}
NSLog(@"begin");
}
-(void)textFieldDidEndEditing:(UITextField *)textField
{
if ([textField.text length] >0){
[self labelWithIndex:currentIndex].hidden = YES;
}
NSLog(@"End edit");
[self dismissViewControllerAnimated:YES completion:nil];
}
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
return YES;
}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
NSLog(@"touchesBegan:withEvent:");
[self.view endEditing:YES];
[super touchesBegan:touches withEvent:event];
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
if (textField == self.emailTextField){
if ([self NSStringIsValidEmail:textField.text]){
[self animateWithTextField:textField];
} else {
[self createAlert];
}
}
return YES;
}
#pragma mark - animation and frame
-(CGRect)rectWithLabe:(UILabel*)label{
CGRect newRect = label.frame;
newRect.origin.y = newRect.origin.y - 25;
newRect.size.width = newRect.size.width + 100;
return newRect;
}
-(void)addTargets{
[self.loginTextField addTarget:self
action:@selector(textFieldDidChange:)
forControlEvents:UIControlEventEditingChanged];
[self.emailTextField addTarget:self
action:@selector(textFieldDidChange:)
forControlEvents:UIControlEventEditingChanged];
[self.emailConfirmTextField addTarget:self
action:@selector(textFieldDidChange:)
forControlEvents:UIControlEventEditingChanged];
}
-(CGRect)finalRectForLabelWithTextField:(UITextField*)textField{
CGRect frameRect = textField.frame;
frameRect.origin.x = 50;
return frameRect;
}
-(void) textFieldDidChange:(UITextField *)textField
{
// Logic for login text field
if([textField.text length]>0){
if (currentIndex == 1 && !loginIsMoved){
NSLog(@"Current index is 1");
[self animateWithLabel:self.enterLoginLabel andRect:[self rectWithLabe:[self enterLoginLabel]]];
loginIsMoved = YES;
}
} else {
if (currentIndex == 1){
// self.rect = self.labelPlaceHolder.frame;
[self animateWithLabel:self.enterLoginLabel andRect:[self finalRectForLabelWithTextField:textField]];
}
loginIsMoved = NO;
}
// Logic for email text field
if([textField.text length]>0){
if (currentIndex == 2 && !emailIsMoved){
NSLog(@"Current index is 1");
[self animateWithLabel:self.enterEmailTextLabel andRect:[self rectWithLabe:[self enterEmailTextLabel]]];
emailIsMoved = YES;
}
} else {
if (currentIndex == 2){
// self.rect = self.labelPlaceHolder.frame;
[self animateWithLabel:self.enterEmailTextLabel andRect:[self finalRectForLabelWithTextField:textField]];
}
emailIsMoved = NO;
}
// Logic for confirm email text field
if([textField.text length]>0){
if (currentIndex == 3 && !emailConfirmIsMoved){
NSLog(@"Current index is 1");
[self animateWithLabel:self.confirmEmailTextLabel andRect:[self rectWithLabe:[self confirmEmailTextLabel ]]];
emailConfirmIsMoved = YES;
}
} else {
if (currentIndex == 3){
// self.rect = self.labelPlaceHolder.frame;
[self animateWithLabel:self.confirmEmailTextLabel andRect:[self finalRectForLabelWithTextField:textField]];
}
emailConfirmIsMoved = NO;
}
}
-(void)createCircle{
UIView *circleView;
circleView = [[UIView alloc] initWithFrame:CGRectMake(100,100,20,20)];
circleView.alpha = 0.5;
circleView.layer.cornerRadius = 10;
circleView.backgroundColor = RGB(0x00, 0xC7, 0x8c);
[self.view addSubview:circleView];
}
-(void)animateWithLabel:(UILabel*)label andRect:(CGRect)rect{
[UIView animateWithDuration:0.3 delay:0 usingSpringWithDamping:0.7 initialSpringVelocity:0.3 options:0 animations:^{
label.frame = rect;
} completion:^(BOOL finished) {
}];
}
-(void)animateWithTextField:(UITextField*)textField{
UIView *circleView;
circleView = [[UIView alloc] initWithFrame:CGRectMake(textField.frame.origin.x, textField.frame.origin.y, 20, 20)];
circleView.alpha = 0.5;
circleView.layer.cornerRadius = 10;
circleView.backgroundColor = RGB(0x00, 0xC7, 0x8c);
circleView.hidden = YES;
[self.view addSubview:circleView];
[UIView animateWithDuration:1.5 delay:0 usingSpringWithDamping:0.7 initialSpringVelocity:0.3 options:0 animations:^{
circleView.hidden = NO;
CGRect newRect = textField.frame;
newRect.origin.y = newRect.origin.y - 25;
newRect.size.width = newRect.size.width + 100;
circleView.frame = CGRectMake(newRect.origin.x, newRect.origin.y, 20, 20);
[self labelWithIndex:2].hidden = YES;
} completion:^(BOOL finished) {
}];
}
#pragma mark - helper methods
-(void)createAlert{
UIAlertController * alert= [UIAlertController
alertControllerWithTitle:@"Ошибка электронного адреса"
message:@"Ваш электронный адрес должен содержать символ @ и название домена"
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction* yesButton = [UIAlertAction
actionWithTitle:@"Сейчас исправлю"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
//Handel your yes please button action here
[alert dismissViewControllerAnimated:YES completion:nil];
}];
[alert addAction:yesButton];
[self presentViewController:alert animated:YES completion:nil];
}
-(UILabel*)labelWithIndex:(int)myIndex{
UILabel *correctLabel;
if (myIndex == 1){
correctLabel = self.enterLoginLabel;
}
if (myIndex == 2){
correctLabel = self.enterEmailTextLabel;
}
if (myIndex == 3){
correctLabel = self.confirmEmailTextLabel;
}
return correctLabel;
}
-(BOOL) NSStringIsValidEmail:(NSString *)checkString
{
BOOL stricterFilter = NO;
NSString *stricterFilterString = @"^[A-Z0-9a-z\\._%+-]+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}$";
NSString *laxString = @"^.+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2}[A-Za-z]*$";
NSString *emailRegex = stricterFilter ? stricterFilterString : laxString;
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
return [emailTest evaluateWithObject:checkString];
}
答案 0 :(得分：1)
删除dismissViewControllerAnimated:YES中的行textFieldDidEndEditing，然后重试。
textFieldDidEndEditing，将在文本字段更改完成后调用。
来自文档：
告诉委托，指定的文本字段已停止编辑。
因此，即使您在文本字段委托方法中显示警报，它也会很快被解雇，因为其他文本字段委托方法将被命中。