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: