UIKit-UITextField

UIKit系列常见处理办法集合

点击任何地方收缩键盘

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self setUpForDismissKeyboard];
}

- (void)setUpForDismissKeyboard {
  NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
  UITapGestureRecognizer *singleTapGR =
  [[UITapGestureRecognizer alloc] initWithTarget:self
                                          action:@selector(tapAnywhereToDismissKeyboard:)];
  NSOperationQueue *mainQuene =[NSOperationQueue mainQueue];
  [nc addObserverForName:UIKeyboardWillShowNotification
                  object:nil
                   queue:mainQuene
              usingBlock:^(NSNotification *note){
                [self.view addGestureRecognizer:singleTapGR];
              }];

  [nc addObserverForName:UIKeyboardWillHideNotification
                  object:nil
                   queue:mainQuene
              usingBlock:^(NSNotification *note){
                [self.view removeGestureRecognizer:singleTapGR];
              }];
}

- (void)tapAnywhereToDismissKeyboard:(UIGestureRecognizer *)gestureRecognizer {
//此method会将self.view里所有的subview的first responder都resign掉
  [self.view endEditing:YES];
}

return 回收键盘

//实现代理方法
-(BOOL) textFieldShouldReturn:(UITextField *)textField{
    if (textField == self.addTextField) {    
        [textField resignFirstResponder];
    }
    return YES;
}

修改textField的placeholder的字体颜色、大小

 [textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];  

 [textField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];  

水印颜色

//上面这句是设置placeHolder的颜色，placeHolderColor是自己需要的颜色
userNameField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"手机号码"
                                    attributes:@{ NSForegroundColorAttributeName:placeHolderColor}];

UITextField实现左侧空出一定的边距

-(void)setTextFieldLeftPadding:(UITextField *)textField forWidth:(CGFloat)leftWidth{
    CGRect frame = textField.frame;
    frame.size.width = leftWidth;
    UIView *leftview = [[UIView alloc] initWithFrame:frame];
    textField.leftViewMode = UITextFieldViewModeAlways;
    textField.leftView = leftview;
}

右边距

//写一个类继承UITextField，重写这个方法：
- (CGRect) rightViewRectForBounds:(CGRect)bounds {
   CGRect textRect = [super rightViewRectForBounds:bounds];
   textRect.origin.x -= 10;
   return textRect;
}
//然后需要的地方，用你自己写的这个类替换UITextField。

视图随键盘提升

-(void)keyboardWillShow:(NSNotification *)sender{
    CGRect frame = _loadButton.frame;
    int offset = frame.origin.y + 32 - (self.view.frame.size.height - 216);//键盘高度216
    if (offset >= 150) {
        offset = 100;
    }
    NSTimeInterval animationDuration = 0.30f;
    [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
    [UIView setAnimationDuration:animationDuration];
    offset = offset + 70;
    //将视图的Y坐标向上移动offset个单位，以使下面腾出地方用于软键盘的显示
    if(offset > 0)
        self.view.frame = CGRectMake(0.0f, -offset, self.view.frame.size.width, self.view.frame.size.height);
    [UIView commitAnimations];
}

-(void)keyboardWillHidden:(NSNotification *)sender{
    if (self.isKeyBoard == NO) {
        if (IOS7) {
            self.view.frame =CGRectMake(0, 64, self.view.frame.size.width, self.view.frame.size.height);
        }else {
            self.view.frame =CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
        }
    }
}

文字置顶

self.automaticallyAdjustsScrollViewInsets = NO;