Update usage in README.md

README.md

@@ -1,2 +1,45 @@
 # XCTextField
+
 A general UITextField category for input checking.
+
+Whatever in which way your textField was created, just add the following methods:
+
+For configuration: `- configurationWithType:`
+
+For check: `- inputCheckForceCorrect:`
+
+## Usage:
+
+1. Download zip or clone the repo.
+2. Drag the folder `XCTextField` into your project.
+3. `#import "UITextField+XCTextField.h"`
+4. Have fun.
+
+## Sample Code:
+
+```objc
+/**
+  some button action such as commit / login / register etc.
+ */
+- (void)checkButtonAction:(UIButton *)button {
+    for (UIView *subview in self.view.subviews) {
+        if ([subview isKindOfClass:[UITextField class]]) {
+            [(UITextField *)subview inputCheckForceCorrect:YES];
+        }
+    }
+}
+```
+
+> `- (void)inputCheckForceCorrect:`
+> param: `flag` if `YES` the first incorrect textField became first responder.
+
+## Paraphrase:
+
+- `XCTextFieldTypeDefault`: Style None.
+- `XCTextFieldTypeCellphone`: PRC mainland Cellphone number style. `UIKeyboardTypePhonePad`.
+- `XCTextFieldTypeEmail`: Email format should be "[email protected]". `UITextContentTypeEmailAddress`.
+- `XCTextFieldTypePassword`: Security text. `UIKeyboardTypeASCIICapable`.
+- `XCTextFieldTypeCAPTCHA`: //@todo:
+- `XCTextFieldTypeCreditCard`: //@todo: Luhn algorithm
+- `XCTextFieldTypeIDCard`: 18 digital PRC resident ID card number verify. The last character was calculated base on "ISO 7064:1983.MOD 11-2" algorithm.
+