IOS客户端Coding项目记录(一)

self.textField.clearButtonMode = UITextFieldViewModeWhileEditing;说明：UITextField.clearButtonMode：清空输入的字符，有以下几种模式UITextFieldViewModeAlways，不为空，获得焦点与没有获得焦点都显示清空按钮UITextFieldViewModeNever,不显示清空按钮UITextFieldViewModeWhileEditing,不为空，且在编辑状态时（及获得焦点）显示清空按钮UITextFieldViewModeUnlessEditing, 不为空，且不在编译状态时（焦点不在输入框上）显示清空按钮扩展：关于键盘类型(UITextField.keyboardType),UITextField.enablesReturnKeyAutomatically = YES当UITextField不为空时高亮,［UITextField ResignFirstResponder］关闭键盘

通过一个视图，定义其位置跟背景就可以，下面代码仅供参考         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];

   self.myTableView.separatorStyle = UITableViewCellSeparatorStyleNone;//不加换行线    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);//缩进    self.myTableView.tableFooterView=[self customFooterView];//方法 返回view，看第五点    self.myTableView.tableHeaderView = [self customHeaderView];扩展：UITableViewCellSelectionStyle选择行的样式UITableViewCellSelectionStyleNone,UITableViewCellSelectionStyleBlue,UITableViewCellSelectionStyleGray如果要自定义cell的背景色cell.selectedBackgroundView = [[[UIView alloc] initWithFrame:cell.frame]];cell.selectedBackgroundView.backgroundColor = [UIColor redColor];改变换行线颜色 tableView.separatorColor = [UIColor blueColor];

- (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:@"登录" andFrame:CGRectMake(18, kScreen_Width > 320? 20: 20, kScreen_Width-18*2, 45) target:self action:@selector(sendLogin)];    [footerV addSubview:_loginBtn];    return footerV;}

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

typedef struct {    CGFloat top, left, bottom, right;} UIEdgeInsets;主要是理解下UIEdgeInsets在IOS UI里的意义.UIEdgeInsets==>这货其实就是插入间隔区域。正值表示间隔值，负值表示超出参照物的距离。

1     UIImage* img=[UIImage imageNamed:@"2.png"];//原图
2     UIEdgeInsets edge=UIEdgeInsetsMake(0, 10, 0,10);
3     //UIImageResizingModeStretch：拉伸模式，通过拉伸UIEdgeInsets指定的矩形区域来填充图片
4     //UIImageResizingModeTile：平铺模式，通过重复显示UIEdgeInsets指定的矩形区域来填充图
5     img= [img resizableImageWithCapInsets:edge resizingMode:UIImageResizingModeStretch];
6     self.imageView.image=img;

可以告知用户有一个操作正在进行中。派生自UIView，所以他是视图，也可以附着在视图上。UIActivityIndicatorView* activityIndicatorView = [ [ UIActivityIndicatorView alloc ]
initWithFrame:CGRectMake(250.0,20.0,30.0,30.0)];设置风格：activityIndicatorView.activityIndicatorViewStyle= UIActivityIndicatorViewStyleGray;UIActivityIndicatorViewStyleWhiteLarge 大型白色指示器UIActivityIndicatorViewStyleWhite 标准尺寸白色指示器UIActivityIndicatorViewStyleGray 灰色指示器，用于白色背景如果希望指示器停止后自动隐藏，那么要设置hidesWhenStoped属性为YES。默认是YES。设置为NO停止后指示器仍会显示。activityIndicatorView.hidesWhenStoped = NO;显示：可以将它附着在任何视图上，比如表格单元、或者视图，[ self.view addSubview:activityIndicatorView ]启动和停止[ activityIndicatorView startAnimating ];//启动[ activityIndicatorView stopAnimating ];//停止判断是否处于运动状态isAnimating[activityIndicatorView isAnimating]下面为一段实例代码_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];

创建一个user defaults方法有多个，最简单得快速创建方法:NSUserDefaults *accountDefaults = [NSUserDefaults standardUserDefaults];添加数据到 user defaults:[accountDefaults setObject:nameField.text forKey:UserDefaultNameKey];也可以添加基本数据类型int, float, bool等，有相应得方法[accountDefaults setBool:YES forKey:UserDefaultBoolKey];从user defaults中获取数据:[accountDefaults objectForKey:NCUserDefaultNameKey]  [accountDefaults boolForKey: UserDefaultBoolKey];注意：UserDefaults不是立即写入，而是根据时间戳定时的把缓存中的数据写入本地磁盘。所以调用了set方法之后数据有可能还没有写入磁盘应用程序就终止了。可以通过调用synchornize方法强制写入。[[NSUserDefaults standardUserDefaults] synchronize]; 代码片段：NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];        [defaults setObject:[NSNumber numberWithBool:YES] forKey:kLoginStatus];        [defaults setObject:loginData forKey:kLoginUserDict];        [defaults synchronize];