工具栏前一个和下按钮逻辑(toolbar previous and next button logi

我使用下面的代码移动到使用的UITextField委托的下一个领域，还我添加工具栏键盘与以前相比，下一个和OK按钮。 该代码是工作的罚款。

就像你看到键盘返回按钮逻辑是非常通用的，使用的UITextField标签，这是一件好事，因为我要使用的码各地。 现在，我需要写一个和下一个按钮逻辑，和我迷路了。 有任何想法吗？

UPDATE（完整的代码，有一些修改，感谢@ 8vius是花了一些时间陪我聊天，使其工作）：

//
// SigninViewController.m
//

#import "SigninViewController.h"

@implementation SigninViewController

@synthesize firstResponder = _firstResponder;
@synthesize toolbar;
@synthesize email;
@synthesize password;

- (void)move:(UIBarButtonItem*)sender {

    NSInteger tag = self.firstResponder.tag;

    if ([sender.title isEqualToString:@"Anterior"]) {
        tag -= 1;
    } else if ([sender.title isEqualToString:@"Próximo"]) {
        tag += 1;
    }

    UITextField *nextTextField = (UITextField*)[self.view viewWithTag:tag];

    if (nextTextField && tag > 0) {
        [nextTextField becomeFirstResponder];
    } else {
        [self.firstResponder resignFirstResponder];
        self.firstResponder = nil;
    }

}

- (void)ok:(id)sender {
    [self.view endEditing:YES];
    self.firstResponder = nil;
}

- (void)textFieldDidBeginEditing:(UITextField*)textField {
    self.firstResponder = textField;
}

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

    NSInteger tag = textField.tag + 1;

    UITextField *nextTextField = (UITextField*)[self.view viewWithTag:tag];

    if (nextTextField) {
        [nextTextField becomeFirstResponder];
    } else {
        [textField resignFirstResponder];
        self.firstResponder = nil;
    }

    return NO;

}

- (void)viewDidLoad {

    [super viewDidLoad];

    self.email.delegate = self;
    self.password.delegate = self;

    if (self.toolbar == nil)
    {
        self.toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, 44)];

        UIBarButtonItem* previous = [[UIBarButtonItem alloc] initWithTitle:@"Anterior" style:UIBarButtonItemStyleBordered target:self action:@selector(move:)];
        UIBarButtonItem* next = [[UIBarButtonItem alloc] initWithTitle:@"Próximo" style:UIBarButtonItemStyleBordered target:self action:@selector(move:)];
        UIBarButtonItem* space = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:(UIBarButtonSystemItemFlexibleSpace) target:nil action:nil];
        UIBarButtonItem* ok = [[UIBarButtonItem alloc] initWithTitle:@"Ok" style:UIBarButtonItemStyleBordered target:self action:@selector(ok:)];

        [self.toolbar setItems:[[NSArray alloc] initWithObjects:previous, next, space, ok, nil]];

        [self.toolbar setTranslucent:YES];
        [self.toolbar setTintColor:[UIColor blackColor]];
    }

    for (UIView* view in self.view.subviews) {
        if ([view isKindOfClass:[UITextField class]]) {
            [(UITextField*)view setInputAccessoryView:toolbar];
        }
    }

}

- (void)viewDidUnload {
    self.email = nil;
    self.password = nil;
    [super viewDidUnload];
}

@end

Answer 1:

这是相当简单的，当你加载你的观点，你设置的tag属性上取决于你希望他们的顺序，那么你必须只穿过上的字段标签元素文本字段：

- (void)toggleTextfield:(UIBarButtonItem *)sender {
  NSInteger nextTag = self.firstResponder.tag;
  if ([sender.title isEqualToString:@"Previous"] && nextTag > 1) {
    nextTag -= 1
  } else if ([sender.title isEqualToString:@"Next"]) {
    nextTag += 1;
  }

  UITextField *nextTextField = (UITextField *)[self.view viewWithTag:nextTag];
  if (nextTextField) {
    [nextTextField becomeFirstResponder];
  }
}

并跟踪谁是第一个响应：

-(void)textFieldDidBeginEditing:(UITextField *)textField {
  self.firstResponder = textField;
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
  [textField resignFirstResponder];
  self.firstResponder = nil;
  return YES;
}

而当你加载你的观点，你绑定的按钮来切换动作：

  UIBarButtonItem *previousButton = [[UIBarButtonItem alloc] initWithTitle:@"Previous" 
                                                                     style:UIBarButtonItemStyleBordered 
                                                                    target:self
                                                                    action:@selector(toggleTextfield:)];
  UIBarButtonItem *nextButton = [[UIBarButtonItem alloc] initWithTitle:@"Next" 
                                                                     style:UIBarButtonItemStyleBordered 
                                                                    target:self
                                                                    action:@selector(toggleTextfield:)];

在我的情况下，例如，设置我的文本字段的表视图中，所以在我cellForRowAtIndexPath方法我设置的tag属性是row的的indexPath 。

编辑：你必须设置firstResponder属性为它工作。

在您的.h文件中：

@property UIView *firstResponder

在您的.m文件：

@synthesize firstResponder = _firstResponder;

文章来源: toolbar previous and next button logic