最近在寫 UITextFiled 的時候發現它有很多 delegate method 可以使用，筆記一下：
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController<UITextFieldDelegate>//TextField的協定
@end
#import "ViewController.h"
@interface ViewController () {
UITextField *your_textfield_1;
UITextField *your_textfield_2;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//設置一個普通的UITextField
your_textfield_1 = [[UITextField alloc]initWithFrame:CGRectMake(20, 40, 250, 40)];//初始化TextField的物件並設置位置與大小
your_textfield_1.delegate = self;//設定給代理才可使用協定
your_textfield_1.borderStyle = UITextBorderStyleLine;//設定樣式
/*
UITextBorderStyleNone無樣式
UITextBorderStyleLine黑色格線
UITextBorderStyleBezel灰色格線
UITextBorderStyleRoundedRect普通圓角框
*/
your_textfield_1.font = [UIFont fontWithName:@"Arial" size:20.0f];//字體的大小以及字型
your_textfield_1.textColor = [UIColor blueColor];//字體顏色
your_textfield_1.backgroundColor = [UIColor yellowColor];//背景顏色
your_textfield_1.placeholder = @"普通的TextField";//設置提示的字
your_textfield_1.autocorrectionType = UITextAutocorrectionTypeNo;//是不是要訂正輸入的字
/*
UITextAutocorrectionTypeDefault,默認
UITextAutocorrectionTypeNo,不自動出現訂正的字
UITextAutocorrectionTypeYes,自動出現訂正的字
*/
your_textfield_1.textAlignment = NSTextAlignmentLeft;//水平對齊方式
your_textfield_1.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;//垂直對齊方式
your_textfield_1.clearButtonMode = UITextFieldViewModeUnlessEditing;//設定"刪除內文"的按鈕選項
/*
UITextFieldViewModeNever,設定不會出現
UITextFieldViewModeWhileEditing,編輯時才出現
UITextFieldViewModeUnlessEditing,編輯時不出現
UITextFieldViewModeAlways總是出現
*/
your_textfield_1.secureTextEntry = NO;//將輸入的內文設置"*"
your_textfield_1.clearsOnBeginEditing = NO;//再次編輯的時候將內容直接清除
your_textfield_1.keyboardType = UIKeyboardTypeDefault;//鍵盤的樣式
/*
UIKeyboardTypeDefault,普通鍵盤樣式
UIKeyboardTypeASCIICapable,支持ASCII的鍵盤樣式
UIKeyboardTypeNumbersAndPunctuation,數字鍵盤有支持＋＊＃等字
UIKeyboardTypeURL,輸入網址時方便的鍵盤
UIKeyboardTypeNumberPad,數字鍵盤
UIKeyboardTypePhonePad,電話鍵盤
UIKeyboardTypeNamePhonePad,電話鍵盤可切換至英文
UIKeyboardTypeEmailAddress,用於輸入電子郵件的鍵盤
UIKeyboardTypeDecimalPad,小數點以及數字鍵盤
UIKeyboardTypeTwitter, 優化的鍵盤，方便输入@、#字符
*/
your_textfield_1.autocapitalizationType = UITextAutocapitalizationTypeNone;//字母是否大寫
/*
UITextAutocapitalizationTypeNone,不自動大寫
UITextAutocapitalizationTypeWords,單字的首字大寫
UITextAutocapitalizationTypeSentences,句字的首字大寫
UITextAutocapitalizationTypeAllCharacters,所有字母大寫
*/
your_textfield_1.returnKeyType =UIReturnKeyDefault;//return键樣式
/*
UIReturnKeyDefault,有Return字符的鍵
UIReturnKeyDone.有Done字符的藍色按钮
UIReturnKeyGo,有GO字符的藍色按钮
UIReturnKeyGoogle,有Google字符的藍色按钮
UIReturnKeyJoin,有Join字符的藍色按钮
UIReturnKeyNext,有Next的藍色按钮
UIReturnKeyRoute,有Route的藍色按钮
UIReturnKeySearch,有Search的藍色按钮
UIReturnKeySend,有Send的藍色按钮
UIReturnKeyYahoo,有Yahoo的藍色按钮
UIReturnKeyEmergencyCall,緊急呼叫按钮
*/
your_textfield_1.keyboardAppearance=UIKeyboardAppearanceAlert;//鍵盤外觀
/*
UIKeyboardAppearanceDefault，淺灰色
UIKeyboardAppearanceAlert，石墨色
*/
[self.view addSubview:your_textfield_1];//加入至view中
//設置有圖片背景以及內文圖的UITextField
your_textfield_2 = [[UITextField alloc]initWithFrame:CGRectMake(20, 100, 250, 40)];//初始化TextField的物件並設置位置與大小
your_textfield_2.delegate=self;//設定給代理才可使用協定
your_textfield_2.borderStyle = UITextBorderStyleNone;//設定UITextBorderStyleNone樣式自由度更高
your_textfield_2.font = [UIFont fontWithName:@"Arial" size:20.0f];//字體的大小以及字型
your_textfield_2.placeholder = @"有圖片的的TextField";//設置提示的字
your_textfield_2.textAlignment = NSTextAlignmentLeft;//水平對齊方式
your_textfield_2.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;//垂直對齊方式
UIImageView *image=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"title.png"]];//初始化UIImageView的物件，並設置圖片
your_textfield_2.leftView=image;//設定圖片在左邊，也可設置右邊
your_textfield_2.leftViewMode = UITextFieldViewModeAlways;//圖片出現的時機
/*
UITextFieldViewModeNever,設定不會出現
UITextFieldViewModeWhileEditing編輯狀態才出現
UITextFieldViewModeUnlessEditing編輯狀態不出現
UITextFieldViewModeAlways總是出現
*/
your_textfield_2.background=[UIImage imageNamed:@"back.png"];
[self.view addSubview:your_textfield_2];//加入至view中
}
//協定裡的動作設定以及觸發方式
//開始編輯的時候會觸發，可設定一些動作在此
- (void)textFieldDidBeginEditing:(UITextField *)textField{
NSLog(@"start");
}
//按下"clearButtonMode"的按鈕會觸發
- (BOOL)textFieldShouldClear:(UITextField *)textField{
NSLog(@"clear");
return YES;
}
//結束編輯時會觸發，傳回BOOL值，可在編輯模式中確定是否要離開編輯模式
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField{
NSLog(@"over");
return YES;//return NO 就會一直在編輯模式
}
//按下Return鍵的反應
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
//縮起鍵盤
[textField resignFirstResponder];
return YES;
}
//傳回BOOL值，指定是否循序內文字段編輯
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
return YES;
}
//限制使用者只能輸入的字串
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:kAlphaNum]invertedSet];//kAlphaNum要先定義才能使用，限定可出現的字符
NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs]componentsJoinedByString:@"="];//不再限定範圍內又可以出現的字符
BOOL canChange = [string isEqualToString:filtered];
return canChange;
}
//限制使用者能輸入的總數
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
//可限定哪些字元可超過 return YES 就是可以輸入文字
if ([string isEqualToString:@"A"]){
return YES;
}
NSString * toBeString = [textField.text stringByReplacingCharactersInRange:range withString:string];//取得輸入框內容 用於計算輸入框的總數
if (your_textfield_1 == textField){ //應用於想使用的輸入框上
if ([toBeString length] > 10) { //超過10個跳出警告
your_textfield_1 = [toBeString substringToIndex:10];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"無法輸入 已超過上線" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
[alert show];
return NO;
}
}
return YES;
}
@end