本文提供的是UITextField切換密碼輸入明暗文的一個(gè)分類(lèi),拿到項(xiàng)目中可以直接使用

.h文件

@interface UITextField (Extention)
//設(shè)置密碼輸入框
- (void)setTextFieldWithFont:(CGFloat)font color:(UIColor *)color alignment:(NSTextAlignment)alignment title:(NSString *)title placeHolder:(NSString *)placeholder;
@end

.m文件

#import "UITextField+Extention.h"
@implementation UITextField (Extention)
- (void)setTextFieldWithFont:(CGFloat)font color:(UIColor *)color alignment:(NSTextAlignment)alignment title:(NSString *)title placeHolder:(NSString *)placeholder{
    
    UIButton *rightImageV = [[UIButton alloc] init];
    self.secureTextEntry = YES;
    [rightImageV setBackgroundImage:[UIImage imageNamed:@"me_invisible"] forState:UIControlStateNormal];
    rightImageV.frame = CGRectMake(0, 0, 23, 23);
    rightImageV.centerY = self.centerY;
    self.rightView = rightImageV;
    self.rightViewMode = UITextFieldViewModeAlways;
    [rightImageV addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchDown];
    self.font = [UIFont systemFontOfSize:font];
    self.textColor = color == nil ? [UIColor blackColor] : color;
    self.textAlignment = alignment;
    self.borderStyle = UITextBorderStyleNone;
    self.text = title == nil ? @"" : title;
    self.placeholder = placeholder == nil ? @"" : placeholder;
}
//監(jiān)聽(tīng)右邊按鈕的點(diǎn)擊,切換密碼輸入明暗文狀態(tài)
-(void)btnClick:(UIButton *)btn{
    //解決明暗文切換后面空格的問(wèn)題的兩種方式
    //NSString* text = self.text;
    //self.text = @" ";
    //self.text = text;
    //[self becomeFirstResponder];
    [self resignFirstResponder];//取消第一響應(yīng)者
    btn.selected = !btn.selected;
    if (!btn.selected) {
        self.font = [UIFont systemFontOfSize:16];
        [btn setBackgroundImage:[UIImage imageNamed:@"me_invisible"] forState:UIControlStateNormal];
        self.secureTextEntry = YES;
    }else{
        self.font = [UIFont systemFontOfSize:16];
        [btn setBackgroundImage:[UIImage imageNamed:@"me_visible"] forState:UIControlStateSelected];
        self.secureTextEntry = NO;
    }
    [self becomeFirstResponder];//放棄第一響應(yīng)者
}

@end

效果圖

test.gif

ps:UITextField其他常用的分類(lèi)類(lèi)方法

// 設(shè)置可以帶背景圖片的文本框
+ (instancetype)setTextFieldWithFont:(CGFloat)font color:(UIColor *)color alignment:(NSTextAlignment)alignment backgroupImage:(UIImage *)image title:(NSString *)title placeHolder:(NSString *)placeholder
{
    UITextField *textField = [[UITextField alloc] init];
    
    textField.font = [UIFont systemFontOfSize:font];
    textField.textColor = color == nil ? [UIColor blackColor] : color;
    textField.textAlignment = alignment;
    textField.borderStyle = UITextBorderStyleNone;
    if (image) {
        textField.background = image;
    }
    textField.text = title == nil ? @"" : title;
    textField.placeholder = placeholder == nil ? @"" : placeholder;
    
    return textField;
}

// 設(shè)置右邊可以帶圖片的文本框
+ (instancetype)setTextFieldWithFont:(CGFloat)font color:(UIColor *)color alignment:(NSTextAlignment)alignment rightImage:(UIImage *)image title:(NSString *)title placeHolder:(NSString *)placeholder{
    
    UITextField *textField = [[UITextField alloc] init];
    
    textField.font = [UIFont systemFontOfSize:font];
    textField.textColor = color == nil ? [UIColor blackColor] : color;
    textField.textAlignment = alignment;
    textField.borderStyle = UITextBorderStyleNone;

    textField.text = title == nil ? @"" : title;
    textField.placeholder = placeholder == nil ? @"" : placeholder;
    
    UIImageView *rightImageV = [[UIImageView alloc] initWithImage:image];
    rightImageV.frame = CGRectMake(0, 0, 23, 23);
    rightImageV.centerY = textField.centerY;
    textField.rightView = rightImageV;
    textField.rightViewMode = UITextFieldViewModeAlways;
    
    return textField;
}

+ (instancetype)textFieldWithFont:(UIFont *)font color:(UIColor *)color alignment:(NSTextAlignment)alignment rightImage:(UIImage *)image title:(NSString *)title placeHolder:(NSString *)placeholder{
    
    UITextField *textField = [[UITextField alloc] init];
    
    textField.font = font;
    textField.textColor = color == nil ? [UIColor blackColor] : color;
    textField.textAlignment = alignment;
    textField.borderStyle = UITextBorderStyleNone;
    
    textField.text = title == nil ? @"" : title;
    textField.placeholder = placeholder == nil ? @"" : placeholder;
    
    UIImageView *rightImageV = [[UIImageView alloc] initWithImage:image];
    rightImageV.frame = CGRectMake(0, 0, 23, 23);
    rightImageV.centerY = textField.centerY;
    textField.rightView = rightImageV;
    textField.rightViewMode = UITextFieldViewModeAlways;
    
    return textField;
}