• IOS的UITextField,UIButton,UIWebView它描述的一些属性和IOS提示图像资源


    有时UI要开发的资源与实际frame不符。这一次,我们要绘制图片

    UIImage* image = [[UIImage imageNamed:@"text_field_bg.png"] stretchableImageWithLeftCapWidth:20 topCapHeight:0];   //stretchableImageWithLeftCapWidth使图片有拉伸效果

    UITextField的属性介绍:

      UITextField* field = [[UITextField alloc] initWithFrame:CGRectMake(80, 10, 170, 30)];
        _textField = field;
        _textField.autoresizingMask = UIViewAutoresizingFlexibleWidth;//自己主动调整自己的位置,使自己的左边距和右边距和superview保持不变
        _textField.enablesReturnKeyAutomatically = YES;  //使return在输入时能够使用
        _textField.placeholder = @"please input:";     //设置hint的值
        _textField.textAlignment = NSTextAlignmentLeft;  //文字靠左显示
        _textField.borderStyle = UITextBorderStyleNone;   //没有边框
        _textField.font = [UIFont systemFontOfSize:18.0f];   //设置字体大小
        _textField.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
        _textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;  //这两个使文字会居中显示
        _textField.clearButtonMode = UITextFieldViewModeWhileEditing;  //当输入时有clear button
        UIImage* image = [[UIImage imageNamed:@"text_field_bg.png"] stretchableImageWithLeftCapWidth:20 topCapHeight:0];   //stretchableImageWithLeftCapWidth使图片有拉伸效果  20表示图片的左边的边框20像素处能够横向拉伸
        _textField.delegate = self; //给textField设置代理
        _textField.background = image;  //背景设置
        _textField.leftViewMode = UITextFieldViewModeAlways;
        CGRect frame = [_textField frame];
        frame.size.width = 15;
        UIView* view1 = [[UIView alloc] initWithFrame:frame];
        _textField.leftView = view1;  //上面几句话设置文字跟textField的左边有些距离
        
        [self.view addSubview:_textField];


    怎样设置让UITextField仅仅能输入英文,先让Controller实现UITextFieldDelegate的代理

    -(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
        if ([string length]) {
            unichar single = [string characterAtIndex:0];
            if (single > 'a' && single < 'z') {
                return YES;
            }else{//输入的数据格式不对
                NSLog(@"格式不对");
                [textField.text stringByReplacingCharactersInRange:range withString:@""];
                return NO;
            }
        }
        return YES;
    }

    假设想使键盘在进入界面的时候就弹出来,能够这样来做:

    [_textFieldbecomeFirstResponder];


    UIButton的属性介绍:

     UIButton* button = [UIButton buttonWithType:UIButtonTypeCustom]; //init一个button,能够自己定义背景
        [button setBackgroundImage:[[UIImage imageNamed:@"cancel_but_bg@2x.png"] stretchableImageWithLeftCapWidth:20 topCapHeight:0] forState:UIControlStateNormal];
        button.frame = CGRectMake(260,10, 49, 30);  //设置button的背景,有normal和highlight两种状态
        [button setBackgroundImage:[[UIImage imageNamed:@"cancel_but_bg2@2x.png"] stretchableImageWithLeftCapWidth:20 topCapHeight:0] forState:UIControlStateHighlighted];
        button.frame = CGRectMake(260,10, 49, 30);
        [button setTitle:@"确定" forState:UIControlStateNormal];  //设置Button的text
        [button setTitleColor:[MyViewController RGBColorFromHexString:@"#333333" alpha:1.0f] forState:UIControlStateNormal];
        [button setTitleColor:[MyViewController RGBColorFromHexString:@"#000000" alpha:1.0f] forState:UIControlStateHighlighted];
        [button addTarget:self action:@selector(onclick) forControlEvents:UIControlEventTouchUpInside];  //假设onclick带冒号则写方法的时候会把button也传过去  像onclick:(id)sender
        [self.view addSubview:button];


    UIWebView的属性介绍:

      UIWebView* webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 46, 320, 480-46)];
        _webView = webView;
        webView.delegate = self;
        NSURL* url = [NSURL URLWithString:@"http://m.baidu.com"];
        NSURLRequest* request = [NSURLRequest requestWithURL:url];
        [webView loadRequest:request];
        [self.view addSubview:webView];

    代码能够在http://download.csdn.net/detail/baidu_nod/7595369下载

    截图:



    版权声明:本文博主原创文章,博客,未经同意不得转载。

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  • 原文地址:https://www.cnblogs.com/bhlsheji/p/4792993.html
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