IOS用戶端Coding項目記錄(一)，ios用戶端coding項目

IOS用戶端Coding項目記錄(一)，ios用戶端coding項目

1:UITextField設定出現清除按鍵

self.textField.clearButtonMode = UITextFieldViewModeWhileEditing;說明：UITextField.clearButtonMode：清空輸入的字元，有以下幾種模式UITextFieldViewModeAlways，不為空白，獲得焦點與沒有獲得焦點都顯示清空按鈕UITextFieldViewModeNever,不顯示清空按鈕UITextFieldViewModeWhileEditing,不為空白，且在編輯狀態時（及獲得焦點）顯示清空按鈕UITextFieldViewModeUnlessEditing, 不為空白，且不在編譯狀態時（焦點不在輸入框上）顯示清空按鈕擴充：關於鍵盤類型(UITextField.keyboardType),UITextField.enablesReturnKeyAutomatically = YES當UITextField不為空白時高亮,［UITextField ResignFirstResponder］關閉鍵盤

2:繪畫一條底線

通過一個視圖，定義其位置跟背景就可以，下面代碼僅供參考         self.backgroundView = nil;         self.backgroundColor = [UIColor clearColor];         UIView* _lineView = [[UIView alloc] initWithFrame:CGRectMake(kInput_OnlyText_Cell_LeftPading, 43.5, kScreen_Width-2*kInput_OnlyText_Cell_LeftPading, 0.5)];        _lineView.backgroundColor = [UIColor colorWithHexString:@"0xaebdc9"];        [self.contentView addSubview:_lineView];

3:表格一些設定

   self.myTableView.separatorStyle = UITableViewCellSeparatorStyleNone;//不加換行線    self.myTableView.backgroundColor = [UIColor colorWithHexString:@"0xfafafa"];    UIView *upBgView = [[UIView alloc] initWithFrame:self.view.bounds];    upBgView.backgroundColor =[UIColor colorWithHexString:@"0x29333f"];    [upBgView setY:-CGRectGetHeight(upBgView.bounds)];    [self.myTableView addSubview:upBgView];        self.myTableView.contentInset = UIEdgeInsetsMake(-kHigher_iOS_6_1_DIS(20), 0, 0, 0);//縮排    self.myTableView.tableFooterView=[self customFooterView];//方法 返回view，看第五點    self.myTableView.tableHeaderView = [self customHeaderView];擴充：UITableViewCellSelectionStyle選擇行的樣式UITableViewCellSelectionStyleNone,UITableViewCellSelectionStyleBlue,UITableViewCellSelectionStyleGray如果要自訂cell的背景色cell.selectedBackgroundView = [[[UIView alloc] initWithFrame:cell.frame]];cell.selectedBackgroundView.backgroundColor = [UIColor redColor];改變換行線顏色 tableView.separatorColor = [UIColor blueColor];

4:可以定義表頭跟底部視圖(代碼接上面)

- (UIView *)customHeaderView{    UIView *headerV = [[UIView alloc] initWithFrame:CGRectMake(0, 0, kScreen_Width, 180)];    UIImageView *loginLogo = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"login_logo"]];    CGFloat loginLogoHeight = CGRectGetHeight(loginLogo.bounds)*kScreen_Width/CGRectGetWidth(loginLogo.bounds);    if (loginLogoHeight > 180) {        [headerV setHeight:loginLogoHeight];    }    loginLogo.frame = CGRectMake(0, 0, kScreen_Width, loginLogoHeight);    [headerV addSubview:loginLogo];    return headerV;}- (UIView *)customFooterView{    UIView *footerV = [[UIView alloc] initWithFrame:CGRectMake(0, 0, kScreen_Width, 100)];    _loginBtn = [UIButton buttonWithStyle:StrapSuccessStyle andTitle:@"登入" andFrame:CGRectMake(18, kScreen_Width > 320? 20: 20, kScreen_Width-18*2, 45) target:self action:@selector(sendLogin)];    [footerV addSubview:_loginBtn];    return footerV;}

5:隱藏本頁的導覽列

- (void)viewDidLoad{    [super viewDidLoad];    [self.navigationController setNavigationBarHidden:YES];}

6：UIEdgeInsets

typedef struct {    CGFloat top, left, bottom, right;} UIEdgeInsets;主要是理解下UIEdgeInsets在IOS UI裡的意義.UIEdgeInsets==>這貨其實就是插入間隔地區。正值表示間隔值，負值表示超出參照物的距離。

7：活動指標UIActivityIndicatorView

可以告知使用者有一個操作進行中中。派生自UIView，所以他是視圖，也可以附著在視圖上。UIActivityIndicatorView* activityIndicatorView = [ [ UIActivityIndicatorView alloc ]
initWithFrame:CGRectMake(250.0,20.0,30.0,30.0)];設定風格：activityIndicatorView.activityIndicatorViewStyle= UIActivityIndicatorViewStyleGray;UIActivityIndicatorViewStyleWhiteLarge 大型白色指標UIActivityIndicatorViewStyleWhite 標準尺寸白色指標UIActivityIndicatorViewStyleGray 灰色指標，用於白色背景如果希望指標停止後自動隱藏，那麼要設定hidesWhenStoped屬性為YES。預設是YES。設定為NO停止後指標仍會顯示。activityIndicatorView.hidesWhenStoped = NO;顯示：可以將它附著在任何視圖上，比如表格單元、或者視圖，[ self.view addSubview:activityIndicatorView ]啟動和停止[ activityIndicatorView startAnimating ];//啟動[ activityIndicatorView stopAnimating ];//停止判斷是否處於運動狀態isAnimating[activityIndicatorView isAnimating]下面為一段執行個體代碼_activityIndicator = [[UIActivityIndicatorView alloc]                                 initWithActivityIndicatorStyle:                                 UIActivityIndicatorViewStyleGray];            CGSize captchaViewSize = _captchaView.bounds.size;            _activityIndicator.hidesWhenStopped = YES;            [_activityIndicator setCenter:CGPointMake(captchaViewSize.width/2, captchaViewSize.height/2)];            [_captchaView addSubview:_activityIndicator];

8:使用NSUserDefaults儲存使用者名稱和密碼

建立一個user defaults方法有多個，最簡單得快速建立方法:NSUserDefaults *accountDefaults = [NSUserDefaults standardUserDefaults];添加資料到 user defaults:[accountDefaults setObject:nameField.text forKey:UserDefaultNameKey];也可以添加基礎資料型別 (Elementary Data Type)int, float, bool等，有相應得方法[accountDefaults setBool:YES forKey:UserDefaultBoolKey];從user defaults中擷取資料:[accountDefaults objectForKey:NCUserDefaultNameKey]  [accountDefaults boolForKey: UserDefaultBoolKey];注意：UserDefaults不是立即寫入，而是根據時間戳記定時的把緩衝中的資料寫入本地磁碟。所以調用了set方法之後資料有可能還沒有寫入磁碟應用程式就終止了。可以通過調用synchornize方法強制寫入。[[NSUserDefaults standardUserDefaults] synchronize]; 程式碼片段：NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];        [defaults setObject:[NSNumber numberWithBool:YES] forKey:kLoginStatus];        [defaults setObject:loginData forKey:kLoginUserDict];        [defaults synchronize];