Question

在所有堆栈溢出中对此问题毫无疑问是奇怪的，但我找不到它:(

让我解释一下。我有一个简单的UITextField应该提供自定义inputAccessoryView。

预期的行为是：

点击文本字段（ACTextField）
显示带有文本字段和按钮（带取消标题）的键盘
输入一些文字（它必须出现在UITextField中 inputField）
按Enter键并查看主文本字段中显示的文字

如果我按下取消，键盘应该消失并让主文本域取消替换

非常类似Apple的消息应用程序

所有作品都很好地解决了两件事：

如果我在键盘上点击垃圾键（只是为了输入随机文本;））应用程序冻结和Xcode显示CPU为99％（无法恢复）
有时内存占用从之后的2/3 MB增长到40 MB 按回车键，应用程序再次冻结

让我们展示一些代码 .h

#import <UIKit/UIKit.h>

@interface ACTextField : UITextField

@end

.m

#import "ACTextField.h"

@interface ACTextField () <UITextFieldDelegate>

@property (nonatomic, retain) UITextField *inputField;
@property (nonatomic, assign) BOOL keyboardOpen; // to check if keyboard is open
@property (nonatomic, retain) NSTimer *timer; //added after an answer

@end

@implementation ACTextField

// method called when timer fire
- (void) fireTimer:(NSTimer *) timer
{
    [self.timer invalidate];
    self.timer = nil; // this line thoesen't change anyting so can be deleted
    [self.inputField becomeFirstResponder];
}

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        [self awakeFromNib];
    }
    return self;
}

-(void)awakeFromNib
{
    self.delegate = self;
    self.keyboardOpen = NO;
}

- (void)cancelPressed:(id)sender
{
    [self.inputField resignFirstResponder];
    [self resignFirstResponder];

    self.keyboardOpen = NO;
}

- (void)dealloc
{
    NSLog(@"dealloc ACTextField %@", self);
    self.inputField = nil;
    self.timer = nil;
}

- (void) designAccessoryView
{
    if (self.inputAccessoryView == nil) {

        CGRect frame = [[UIScreen mainScreen] bounds];

        self.inputAccessoryView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, 44)];

        self.inputAccessoryView.autoresizingMask = UIViewAutoresizingFlexibleWidth;

        int buttonWidth = 65;
        int padding = 5;

        UIButton *cancel = [UIButton buttonWithType:UIButtonTypeCustom];
        cancel.frame = CGRectMake(padding, 0, buttonWidth, 44);
        [cancel setTitle:@"cancel" forState:UIControlStateNormal];
        [cancel setTitle:@"cancel" forState:UIControlStateHighlighted];
        [cancel addTarget:self action:@selector(cancelPressed:) forControlEvents:UIControlEventTouchUpInside];
        [self.inputAccessoryView addSubview:cancel];

        self.inputField = [[UITextField alloc] initWithFrame:CGRectMake(buttonWidth + 2*padding, 2, frame.size.width - buttonWidth - 3*padding, 40)];
        self.inputField.borderStyle = UITextBorderStyleRoundedRect;

        self.inputField.delegate = self;

        [self.inputAccessoryView addSubview:self.inputField];
        self.inputAccessoryView.backgroundColor = [UIColor lightGrayColor];
    }
}

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
    return YES;
}
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    if (!self.keyboardOpen && textField == self)
    {
        self.inputField.text = self.text;
        [self designAccessoryView];

        self.timer = [NSTimer scheduledTimerWithTimeInterval:0.1
                                         target:self // modified to use the instance method fireTimer
                                       selector:@selector(fireTimer:)
                                       userInfo:nil
                                        repeats:NO];

        self.keyboardOpen = YES;
    }
}
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
    return YES;
}

- (void)textFieldDidEndEditing:(UITextField *)textField
{
}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    return YES;
}

- (BOOL)textFieldShouldClear:(UITextField *)textField
{
    return YES;
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField{

    self.text = self.inputField.text;
    [self cancelPressed:self];

    return YES;
}

@end

非常感谢任何帮助

EDIT2：我尝试使用UITextField Wrapper和几乎相同的代码，一切顺利。行为是预期的，键盘不再冻结，内存保持低位。好的，但我需要一个UITextField子类，而不是一个包装器:(

使用自定义inputAccessoryView自定义uitextfield

0 个答案: