在 UITextField 中按下空格键时打开 Shift 键

Question

当用户按下 UITextField 的空格键时，如何以编程方式打开键盘上的 shift 键（以便下一个字符为大写）？

此外，我不希望文本字段中有任何空格，这样用户就可以键入如下条目："ThisIsATest"

我目前使用以下检测空格键是否被按下，return false 以避免空格，但我不知道如何切换 shift 键：

// check if string in UITextField is a space
if (string == " "){ 
// do not return a space
return false
}

Answer 1

我觉得问题是

string == @" " 是错误的。

字符串相等使用：

[string isEqualToString:@" "]

希望对你有所帮助:)

Answer 2

您需要设置 textField 的 autoCapitalizationType。根据您的要求，您需要设置 Words

来自 Docs :

Discussion This property determines at what times the Shift key is automatically pressed, thereby making the typed character a capital letter. The default value for this property is UITextAutocapitalizationTypeSentences.

SWIFT

enum UITextAutocapitalizationType : Int {
    case None
    case Words
    case Sentences
    case AllCharacters
}

Constants (For All : Available in iOS 2.0 and later.)

None : Do not capitalize any text automatically.

Words : Capitalize the first letter of each word automatically.

Sentences : Capitalize the first letter of each sentence automatically.

AllCharacters : Capitalize all characters automatically.

OBJECTIVE C

typedef enum : NSInteger {
   UITextAutocapitalizationTypeNone,
   UITextAutocapitalizationTypeWords,
   UITextAutocapitalizationTypeSentences,
   UITextAutocapitalizationTypeAllCharacters,
} UITextAutocapitalizationType;

Constants (For All : Available in iOS 2.0 and later.)

UITextAutocapitalizationTypeNone : Do not capitalize any text automatically.

UITextAutocapitalizationTypeWords : Capitalize the first letter of each word automatically.

UITextAutocapitalizationTypeSentences : Capitalize the first letter of each sentence automatically.

UITextAutocapitalizationTypeAllCharacters : Capitalize all characters automatically.

就像：

SWIFT

textField.autocapitalizationType = UITextAutocapitalizationType.Words

OBJECTIVE C

textField.autocapitalizationType = UITextAutocapitalizationTypeWords;

尽情享受....

Answer 3

更新的答案

这已经过测试，当您在每个单词后按 space 栏时，它会打印 "ThisIsATest"。我还不太擅长 Swift，所以这个片段在 Obj-C 中。这很简单。请务必在代码或 IB 中将文本字段的委托设置为 ViewController。

#import "ViewController.h"

@interface ViewController () <UITextFieldDelegate>

@property (nonatomic, assign) BOOL shouldCapitalizeNextChar;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.shouldCapitalizeNextChar = YES;

}


- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {


    if ([string isEqualToString:@" "]) {

        self.shouldCapitalizeNextChar = YES;

        return NO;
    }

    if (self.shouldCapitalizeNextChar) {

        NSString *capitalizedChar = [string capitalizedString];

        textField.text = [textField.text stringByAppendingString:capitalizedChar];

        self.shouldCapitalizeNextChar = NO;

        return NO;
    }

    return YES;
}


@end

和以前一样，这不适用于复制和粘贴的文本。但它应该可以帮助您理解。

原始答案

UITextField 知道如何将每个单词自动大写，如果这是您想要在您的应用程序中使用的内容，请使用：

Obj-c

textField.autocapitalizationType = UITextAutocapitalizationTypeWords;

Swift

textField.autocapitalizationType = UITextAutocapitalizationType.Words

请注意，这只是对用户的建议，he/she 可以通过按 shift 来覆盖它。如果使用粘贴选项也不行。

在 UITextField 中按下空格键时打开 Shift 键

Turn on Shift key when spacebar is pressed in UITextField

uitextfield

ios

swift