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
使用textRectForBounds:是正确的方法。我已经在我的子类中包装了这个,所以你可以简单地使用textEdgeInsets。看到SSTextField。
其他回答
我子类化UITextField来处理这个,它支持左,上,右和底部的插入,以及清除按钮的定位。
MRDInsetTextField.h
#import <UIKit/UIKit.h>
@interface MRDInsetTextField : UITextField
@property (nonatomic, assign) CGRect inset;
@end
MRDInsetTextField.m
#import "MRDInsetTextField.h"
@implementation MRDInsetTextField
- (id)init
{
self = [super init];
if (self) {
_inset = CGRectZero;
}
return self;
}
- (id)initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];
if (self) {
_inset = CGRectZero;
}
return self;
}
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
_inset = CGRectZero;
}
return self;
}
- (void)setInset:(CGRect)inset {
_inset = inset;
[self setNeedsLayout];
}
- (CGRect)getRectForBounds:(CGRect)bounds withInset:(CGRect)inset {
CGRect newRect = CGRectMake(
bounds.origin.x + inset.origin.x,
bounds.origin.y + inset.origin.y,
bounds.origin.x + bounds.size.width - inset.origin.x - inset.size.width,
bounds.origin.y + bounds.size.height - inset.origin.y - inset.size.height
);
return newRect;
}
- (CGRect)textRectForBounds:(CGRect)bounds {
return [self getRectForBounds:[super textRectForBounds:bounds] withInset:_inset];
}
- (CGRect)placeholderRectForBounds:(CGRect)bounds {
return [self getRectForBounds:bounds withInset:_inset];
}
- (CGRect)editingRectForBounds:(CGRect)bounds {
return [self getRectForBounds:[super editingRectForBounds:bounds] withInset:_inset];
}
- (CGRect)clearButtonRectForBounds:(CGRect)bounds {
return CGRectOffset([super clearButtonRectForBounds:bounds], -_inset.size.width, _inset.origin.y/2 - _inset.size.height/2);
}
@end
*_someTextField*来自nib/storyboard视图,带有MRDInsetTextField自定义类的用法示例
[(MRDInsetTextField*)_someTextField setInset:CGRectMake(5, 0, 5, 0)]; // left, top, right, bottom inset
如果你想改变TOP和LEFT缩进只有这样
//占位符
- (CGRect)textRectForBounds:(CGRect)bounds {
CGRect frame = bounds;
frame.origin.y = 3;
frame.origin.x = 5;
bounds = frame;
return CGRectInset( bounds , 0 , 0 );
}
//文本位置
- (CGRect)editingRectForBounds:(CGRect)bounds {
CGRect frame = bounds;
frame.origin.y = 3;
frame.origin.x = 5;
bounds = frame;
return CGRectInset( bounds , 0 , 0 );
}
快速解决没有子类&也检查
extension UITextField {
@IBInspectable var textInsets: CGPoint {
get {
return CGPoint.zero
}
set {
layer.sublayerTransform = CATransform3DMakeTranslation(newValue.x, newValue.y, 0);
}
}
}
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。
下面是在Swift 3中编写的相同子类UITextField。它与之前的Swift版本有很大的不同,正如你将看到的:
import UIKit
class MyTextField: UITextField
{
let inset: CGFloat = 10
// placeholder position
override func textRect(forBounds bounds: CGRect) -> CGRect
{
return bounds.insetBy(dx: inset, dy: inset)
}
// text position
override func editingRect(forBounds bounds: CGRect) -> CGRect
{
return bounds.insetBy(dx: inset, dy: inset)
}
override func placeholderRect(forBounds bounds: CGRect) -> CGRect
{
return bounds.insetBy(dx: inset, dy: inset)
}
}
顺便说一句,如果你只想控制一侧的插入,你也可以像下面这样做。如果你把一个图像放在UITextField的顶部,但你想让它在用户看来是在文本框中,那么这个只调整左边插图的特殊例子就很方便了:
override func editingRect(forBounds bounds: CGRect) -> CGRect
{
return CGRect.init(x: bounds.origin.x + inset, y: bounds.origin.y, width: bounds.width - inset, height: bounds.height)
}