我想插入一个UITextField的文本。
这可能吗?
我想插入一个UITextField的文本。
这可能吗?
当前回答
我发现了罗伯托发布的选项。buratti是最快的解决方案,这里是Swift:
let leftView = UIView(frame: CGRect(x: 0, y: 0, width: 10, height: textField.frame.size.height))
leftView.backgroundColor = textField.backgroundColor
textField.leftView = leftView
textField.leftViewMode = UITextField.ViewMode.always
其他回答
你可以通过使文本字段成为UITextField的子类并覆盖-textRectForBounds:方法来调整文本在文本字段中的位置。
斯威夫特
// adjust place holder text
let paddingView = UIView(frame: CGRectMake(0, 0, 10, usernameOrEmailField.frame.height))
usernameOrEmailField.leftView = paddingView
usernameOrEmailField.leftViewMode = UITextFieldViewMode.Always
为UITextField添加填充的一个好方法是子类化UITextField并添加一个edgeInsets属性。然后设置edgeInsets和UITextField将相应地绘制。对于自定义的leftView或rightView集,这也能正确地发挥作用。
OSTextField.h
#import <UIKit/UIKit.h>
@interface OSTextField : UITextField
@property (nonatomic, assign) UIEdgeInsets edgeInsets;
@end
OSTextField.m
#import "OSTextField.h"
@implementation OSTextField
- (id)initWithFrame:(CGRect)frame{
self = [super initWithFrame:frame];
if (self) {
self.edgeInsets = UIEdgeInsetsMake(0, 0, 0, 0);
}
return self;
}
-(id)initWithCoder:(NSCoder *)aDecoder{
self = [super initWithCoder:aDecoder];
if(self){
self.edgeInsets = UIEdgeInsetsMake(0, 0, 0, 0);
}
return self;
}
- (CGRect)textRectForBounds:(CGRect)bounds {
return [super textRectForBounds:UIEdgeInsetsInsetRect(bounds, self.edgeInsets)];
}
- (CGRect)editingRectForBounds:(CGRect)bounds {
return [super editingRectForBounds:UIEdgeInsetsInsetRect(bounds, self.edgeInsets)];
}
@end
如果你只需要左边空白,你可以试试这个:
UItextField *textField = [[UITextField alloc] initWithFrame:...];
UIView *leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, textField.frame.size.height)];
leftView.backgroundColor = textField.backgroundColor;
textField.leftView = leftView;
textField.leftViewMode = UITextFieldViewModeAlways;
这对我很管用。我希望这能有所帮助。
下面是一个全面的Swift答案,包括一个leftView(自定义图标)和一个自定义清除按钮,两者都设置在界面生成器中,具有可定制的insets。
import UIKit
@IBDesignable
class InsetTextField: UITextField {
@IBInspectable var leftInset:CGFloat = 0
@IBInspectable var rightInset:CGFloat = 0
@IBInspectable var icon:UIImage? { didSet {
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 16, height: 16))
imageView.image = icon
self.leftView = imageView
self.leftViewMode = .Always
} }
@IBInspectable var clearButton:UIImage? { didSet {
let button = UIButton(type: .Custom)
button.setImage(clearButton, forState: .Normal)
button.addTarget(self, action: "clear", forControlEvents: UIControlEvents.TouchUpInside)
button.frame = CGRect(x: 0, y: 0, width: 18, height: 18)
self.rightView = button
self.rightViewMode = .WhileEditing
} }
func clear() {
self.text = ""
}
override func leftViewRectForBounds(bounds: CGRect) -> CGRect {
var height:CGFloat = 0
var width:CGFloat = 0
if let leftView = self.leftView {
height = leftView.bounds.height
width = leftView.bounds.width
}
return CGRect(x: leftInset, y: bounds.height/2 - height/2, width: width, height: height)
}
override func rightViewRectForBounds(bounds: CGRect) -> CGRect {
var height:CGFloat = 0
var width:CGFloat = 0
if let rightView = self.rightView {
height = rightView.bounds.height
width = rightView.bounds.width
}
return CGRect(x: bounds.width - width - rightInset, y: bounds.height/2 - height/2, width: width, height: height)
}
}