NSString *chString = @"中国abc";
NSUInteger utf8Bytes = [chString lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"utf8Bytes:%ld", utf8Bytes); //9
NSUInteger unicodeBytes = [chString lengthOfBytesUsingEncoding:NSUnicodeStringEncoding];
NSLog(@"unicodeBytes:%ld", unicodeBytes); //10

//指定压缩阈值,压缩图片
+ (NSData *)za_compressImage:(UIImage *)image toMaxFileSize:(NSInteger)maxFileSize {
    CGFloat compression = 0.9f;
    CGFloat minCompression = 0.1f;
    NSData *imageData = UIImageJPEGRepresentation(image, compression);
    while ([imageData length] > maxFileSize && compression > minCompression) {
        compression -= 0.05;
        imageData = UIImageJPEGRepresentation(image, compression);
    }
    return imageData;
}

UITapGestureRecognizer *tapGes = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tappedView:)];
tapGes.delegate = self;
tapGes.cancelsTouchesInView = NO; //重要
[self.view addGestureRecognizer:tapGes];

- (void)showPopView
{
    //提交成功
    SCLAlertView *alertView = [[SCLAlertView alloc] initWithNewWindowWidth:310];
    //去掉顶部圆圈
    [alertView removeTopCircle];
    //按钮水平放置
    [alertView setHorizontalButtons:YES];
    //设置出现动画
    alertView.showAnimationType = SCLAlertViewShowAnimationSimplyAppear;
    alertView.shouldDismissOnTapOutside = NO;
    
    //设置title的字体和颜色
    alertView.labelTitle.font = [UIFont pingFangSCWithSize:16];
    alertView.labelTitle.textColor = [UIColor blackColor];
    
    //设置富文本的subTitle
    alertView.attributedFormatBlock = ^NSAttributedString *(NSString *value) {
        return [NSString attributeString:value subString:@"13812341234" subStrColor:kRedColorRegular font:[UIFont pingFangSCWithSize:16] otherStrColor:[UIColor colorWithHexString:@"#818181"]];
    };
    [alertView setBodyTextFontFamily:@"PingFangSC-Regular" withSize:16];
    //设置普通文本的subTitle
//    alertView.viewText.font = [UIFont pingFangSCWithSize:16];
//    alertView.viewText.textColor = [UIColor colorWithHexString:@"#818181"];

    //设置Buttons, top circle and borders的颜色简便方法
    alertView.customViewColor = [UIColor redColor];
    //统一设置按钮的配置强大方法
    alertView.buttonFormatBlock = ^ NSDictionary *{
        return @{@"backgroundColor": [UIColor cyanColor]};
    };
    
    SCLButton *authPersonalBtn = [alertView addButton:@"取消" actionBlock:^(void) {
        DLog(@"取消按钮被按下");
    }];
    authPersonalBtn.titleLabel.font = [UIFont pingFangSCWithSize:16];
    authPersonalBtn.buttonFormatBlock = ^ NSDictionary *{
        return @{@"backgroundColor": [UIColor whiteColor], @"textColor": [UIColor colorWithHexString:@"#818181"], @"borderWidth": @0};
    };
    
    SCLButton *authCompanyBtn = [alertView addButton:@"去注册" actionBlock:^(void) {
        DLog(@"去注册按钮被按下");
    }];
    authCompanyBtn.titleLabel.font = [UIFont pingFangSCWithSize:16];
    //单独设置某个按钮的配置
    authCompanyBtn.buttonFormatBlock = ^ NSDictionary *{
        return @{@"backgroundColor": [UIColor whiteColor], @"textColor": [UIColor blackColor], @"borderWidth": @0};
    };
    
    [alertView showSuccess:self title:@"手机号码未注册" subTitle:@"手机号码 13812341234 未注册， 请注册后再登录。" closeButtonTitle:nil duration:0.0f];
}

[self.passwordTextField addTarget:self action:@selector(passwordTextFieldTextDidChanged:) forControlEvents:UIControlEventValueChanged];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(passwordTextFieldTextDidChanged:) name:UITextFieldTextDidChangeNotification object:nil];

NSString* enString= @"abc";
NSData* utf8EnData = [enString dataUsingEncoding:NSUTF8StringEncoding];

/*
 The -bytes method returns a pointer to a contiguous region of memory managed by the receiver.
 If the regions of memory represented by the receiver are already contiguous, it does so in O(1) time, otherwise it may take longer
 Using -enumerateByteRangesUsingBlock: will be efficient for both contiguous and discontiguous data.
 */
@property (readonly) const void *bytes NS_RETURNS_INNER_POINTER;