我已经有这个问题好几个星期了。因为我的应用需要一个函数来创建 UITextfield、撤消和删除 UITextfield。当您点击它时，我的代码会在视图上的任何位置创建文本字段。它还可以撤消按下按钮撤消时创建的最后一个文本字段，它也可以移动，缩放，旋转，但是在我创建另一个新文本字段后，旧文本字段已附加到视图中。这就是为什么当我长按旧文本字段时，它可以被删除，只有创建的新文本才能被删除。我该怎么做才能删除那个旧的文本字段？这里是我的代码。
ViewController.h
#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>
@interface ViewController : UIViewController<UITextFieldDelegate, UIGestureRecognizerDelegate>
{
NSMutableArray *textfieldform;//array for textfield
UITextField *textField1;//a textfield
CGPoint prevPanPoint;// float for moving the textfield anywhere
float prevPinchScale;// float for pinching the textfield
float prevRotation;// float for rotating the textfield
}
@property (nonatomic, retain) NSMutableArray *textfieldform;//array for creating multiple textfield
-(IBAction) undo;
- (IBAction)handleTap2:(UITapGestureRecognizer *)recognizer;
-(IBAction)panGestureAction:(UIPanGestureRecognizer *)pan;
- (IBAction)scaleImage:(UIPinchGestureRecognizer *)recognizer;
- (IBAction)rotateImage:(UIRotationGestureRecognizer *)recognizer;
@end
ViewController.m
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
@synthesize textfieldform;
- (void)viewDidLoad{
[super viewDidLoad];
//textfieldform = [[NSMutableArray alloc] init];
// Do any additional setup after loading the view, typically from a nib.
textfieldform = [NSMutableArray arrayWithCapacity:0];//array of the textfield
}
//connected to the self.view
-(IBAction) longPressGesture:(UIGestureRecognizer*)gesture{
[textfieldform removeObject:textField1];
[textField1 removeFromSuperview];
NSLog(@"baaaaaaam!");
}
//make the textfield move to any direction in the self.view
-(IBAction)panGestureAction:(UIPanGestureRecognizer *)pan {
CGPoint translation = [pan translationInView:self.view];
textField1.transform = CGAffineTransformTranslate(textField1.transform, translation.x, translation.y);
[pan setTranslation:CGPointZero inView:self.view];
}
//to make the use of gesture simultaneously within the view
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
return YES;
}
//to make the use of gesture simultaneously
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
if([touch.view isKindOfClass:[UIControl class]]) {
return YES;
}
return NO;
}
//to pinch the textfield using 2 fingers.
- (IBAction)scaleImage:(UIPinchGestureRecognizer *)recognizer{
textField1.transform = CGAffineTransformScale(textField1.transform, recognizer.scale, recognizer.scale);
recognizer.scale = 1;
}
//to rotate the textfield using 2 fingers
- (IBAction)rotateImage:(UIRotationGestureRecognizer *)recognizer{
textField1.transform = CGAffineTransformRotate(textField1.transform, recognizer.rotation);
recognizer.rotation = 0;
}
//to remove the last textfield that was been created
-(IBAction)undo{
UITextField *textFieldToRemove = [textfieldform lastObject];
if (textFieldToRemove) {
[textfieldform removeObject:textFieldToRemove];
[textFieldToRemove removeFromSuperview];
}
}
// for the editing of the textfield
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
NSLog(@"textFieldShouldBeginEditing");
return YES;
}
- (void)textFieldDidBeginEditing:(UITextField *)textField{
NSLog(@"textFieldDidBeginEditing");
[textField1 setBackgroundColor:[UIColor colorWithRed:(248/255.0) green:(248/255.0) blue:(255/255.0) alpha:1.0]];
textField1.borderStyle = UITextBorderStyleRoundedRect;
}
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField{
NSLog(@"textFieldShouldEndEditing");
textField.backgroundColor = [UIColor clearColor];
return YES;
}
- (void)textFieldDidEndEditing:(UITextField *)textField{
NSLog(@"textFieldDidEndEditing");
[textField1 setBackgroundColor:[UIColor clearColor]];
textField1.borderStyle = UITextBorderStyleNone;
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
NSLog(@"textField:shouldChangeCharactersInRange:replacementString:");
if ([string isEqualToString:@"#"]) {
return NO;
}
else {
return YES;
}
}
- (BOOL)textFieldShouldClear:(UITextField *)textField{
NSLog(@"textFieldShouldClear:");
return YES;
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField{
NSLog(@"textFieldShouldReturn:");
if (textField.tag == textfieldform.count) {
textField1 = (UITextField *)[self.view viewWithTag:textfieldform.count];
[textField1 becomeFirstResponder];
}
else {
[textField resignFirstResponder];
}
return YES;
}
//when tap the user can create a textfield on any direction, it create many different textfield. according to how many tap you do on the view
- (IBAction)handleTap2:(UITapGestureRecognizer *)recognizer{
if (recognizer.state == UIGestureRecognizerStateEnded){
CGPoint point = [recognizer locationInView:[self view]];
textField1 = [[UITextField alloc] init];
textField1.borderStyle = UITextBorderStyleLine;
[textField1 setAdjustsFontSizeToFitWidth:YES];
[textField1 setText:@"TextField"];
CGRect frame ;
frame.origin.x = point.x;
frame.origin.y = point.y;
frame.size.width=200;
frame.size.height=40;
textField1.frame=frame;
textField1.autocorrectionType = UITextAutocorrectionTypeNo;
textField1.keyboardType = UIKeyboardTypeDefault;
textField1.returnKeyType = UIReturnKeyDefault;
textField1.clearButtonMode = UITextFieldViewModeWhileEditing;
textField1.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
textField1.delegate = self;
textField1.tag = textfieldform.count;
[textfieldform addObject:textField1];
[self.view addSubview:textField1];
[textField1 setAdjustsFontSizeToFitWidth:YES];
}
}
- (void)viewDidUnload{
[super viewDidUnload];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}