Objective c textRectForBounds:在从Nib加载的自定义UITextFields上未调用

我创建了UITextField的一个子类，它覆盖[text | editing | placeholder]RectForBounds：（都使用完全相同的实现）。当从代码实例化时，一切都可以正常工作，但当从nib加载时就不行了。在从nib加载的文本字段上，既不绘制文本也不绘制占位符

我注意到，在用户点击文本字段之前，不会调用任何RectForBounds方法；点击时，使用正确的边界大小（{0，0}，{300，39}}）调用编辑和占位符rectforbounds，而使用（{0，0}，{100，100}）调用textRectForBounds

那么，为什么从不绘制文本（并且只在从nib加载的字段上绘制）？我是做错了什么，还是这是UITextField的错误

编辑：

代码如下：

#import "SearchTextField.h"
#import <QuartzCore/QuartzCore.h>

#define BUTTON_WIDTH 50
#define MAX_LABEL_WIDTH 200

@interface SearchTextField ()

@property(retain, nonatomic) UILabel *label;
@property(retain, nonatomic) UIButton *button;

- (void)i_baseInit;

@end

@implementation SearchTextField

@synthesize title = _title;
@synthesize label = label_;
@synthesize button = button_;
@synthesize showButton = _showButton;
@synthesize backgroundView = _my_backgroundView;

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self)
    {
        _showButton = YES;
        [self i_baseInit];
    }
    return self;
}

- (id)initWithCoder:(NSCoder *)aDecoder
{
    if (self = [super initWithCoder:aDecoder])
    {
        [self i_baseInit];
    }
    return self;
}

- (void)i_baseInit
{
    self.opaque = NO;
    self.textAlignment = UITextAlignmentRight;
    self.leftViewMode = UITextFieldViewModeAlways;
    self.rightViewMode = UITextFieldViewModeAlways;
    self.backgroundColor = [UIColor clearColor];

    _my_backgroundView = [[MyView alloc] init];
    self.backgroundView.backgroundColor = [UIColor whiteColor];

    self.label = [[[UILabel alloc] init] autorelease];
    self.label.font = [UIFont fontWithName:@"HelveticaNeue-CondensedBold" size:15];
    self.label.textColor = [UIColor darkGrayColor];
    self.label.textAlignment = UITextAlignmentRight;
    self.label.backgroundColor = [UIColor clearColor];
    self.label.text = _title;
    self.leftView = self.label;

    self.button = [UIButton buttonWithType:UIButtonTypeCustom];
    [self.button setBackgroundImage:[UIImage imageNamed:@"button_sm"]
                           forState:UIControlStateNormal];
    [self.button setBackgroundImage:[UIImage imageNamed:@"button_sm_pressed"]
                           forState:UIControlStateHighlighted];
    self.button.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleLeftMargin;
    self.button.hidden = !_showButton;
    self.rightView = self.button;
}

- (void)drawRect:(CGRect)rect
{
    self.backgroundView.frame = CGRectMake(self.bounds.origin.x,
                                           self.bounds.origin.y,
                                           self.bounds.size.width-1, // Without this, the background sticks out 1 pt from the button
                                           self.bounds.size.height);
    [self.backgroundView drawRect:rect];
}

- (id)copy
{
    SearchTextField *copy = [[self.class alloc] initWithFrame:self.frame];
    copy.text = self.text;
    copy.textAlignment = self.textAlignment;
    copy.textColor = self.textColor;

    copy.placeholder = self.placeholder;

    copy.background = self.background;
    copy.backgroundColor = self.backgroundColor;

    copy.borderStyle = self.borderStyle;
    copy.font = self.font;
    copy.showButton = self.showButton;
    copy.title = self.title;

    copy.delegate = self.delegate;

    copy.secureTextEntry = self.secureTextEntry;

    copy.returnKeyType = self.returnKeyType;
    copy.keyboardType = self.keyboardType;

    return copy;
}

#pragma mark - UITextField Positioning -

- (CGRect)textRectForBounds:(CGRect)bounds
{
    CGSize labelSize = [self.label.text sizeWithFont:self.label.font constrainedToSize:CGSizeMake(MAX_LABEL_WIDTH, bounds.size.height)];
    CGSize textSize = [@"Test" sizeWithFont:self.font];
    CGRect rect = CGRectMake(10 + labelSize.width,
                      (bounds.size.height-textSize.height)/2,
                      bounds.size.width - (20 + labelSize.width + ((self.showButton) ? BUTTON_WIDTH : 0)),
                      textSize.height);
    return rect;
}

- (CGRect)placeholderRectForBounds:(CGRect)bounds
{
    return [self textRectForBounds:bounds];
}

- (CGRect)editingRectForBounds:(CGRect)bounds
{
    return [self textRectForBounds:bounds];
}

- (CGRect)leftViewRectForBounds:(CGRect)bounds
{
    return CGRectMake(10,
                      0,
                      [self.label.text sizeWithFont:self.label.font constrainedToSize:CGSizeMake(MAX_LABEL_WIDTH, bounds.size.height)].width,
                      bounds.size.height);
}

- (CGRect)rightViewRectForBounds:(CGRect)bounds
{
    if (!self.showButton) { return CGRectZero; }

    return CGRectMake(bounds.size.width-BUTTON_WIDTH,
                      0,
                      BUTTON_WIDTH,
                      bounds.size.height);
}

#pragma mark -

- (void)setTitle:(NSString *)title
{
    [_title release];
    _title = [title retain];
    self.label.text = title;
    [self setNeedsLayout];
}

- (UIImage *)imageForState:(UIControlState)state
{
    return [self.button imageForState:state];
}

- (void)setImage:(UIImage *)image forState:(UIControlState)state
{
    [self.button setImage:image forState:state];
}

- (void)addTarget:(id)target action:(SEL)action forControlEvents:(UIControlEvents)controlEvents
{
    [self.button addTarget:target action:action forControlEvents:controlEvents];
}

- (void)setShowButton:(BOOL)showButton
{
    self.button.hidden = !showButton;
    _showButton = showButton;
    [self setNeedsLayout];
}

- (MyView *)backgroundView
{
    [self setNeedsDisplay];
    return _my_backgroundView;
}
- (void)dealloc
{
    [_my_backgroundView release];
    [label_ release];
    [button_ release];

    [super dealloc];
}

@end

#导入“SearchTextField.h”
#进口
#定义按钮宽度50
#定义最大标签宽度200
@接口SearchTextField（）
@属性（保留，非原子）UILabel*标签；
@属性（保留，非原子）UIButton*按钮；
-（无效）i_baseInit；
@结束
@实现SearchTextField
@综合标题=_标题；
@综合标签=标签；
@合成按钮=按钮；
@综合showButton=\u showButton；
@综合背景视图=\u我的\u背景视图；
-（id）initWithFrame:（CGRect）帧
{
self=[super initWithFrame:frame]；
如果（自我）
{
_showButton=是；
[self i_baseInit]；
}
回归自我；
}
-（id）initWithCoder:（NSCoder*）aDecoder
{
if（self=[super initWithCoder:aDecoder]）
{
[self i_baseInit]；
}
回归自我；
}
-（无效）i_baseInit
{
self.不透明=否；
self.textAlignment=UITextAlignmentRight；
self.leftViewMode=UITextFieldViewModeAlways；
self.rightViewMode=UITextFieldViewModeAlways；
self.backgroundColor=[UIColor clearColor]；
_my_backgroundView=[[MyView alloc]init]；
self.backgroundView.backgroundColor=[UIColor whiteColor]；
self.label=[[UILabel alloc]init]autorelease]；
self.label.font=[UIFont fontWithName:@“HelveticaNeue CondensedBold”大小：15]；
self.label.textColor=[UIColor darkGrayColor]；
self.label.textAlignment=UITextAlignmentRight；
self.label.backgroundColor=[UIColor clearColor]；
self.label.text=\u title；
self.leftView=self.label；
self.button=[UIButton buttonWithType:UIButtonTypeCustom]；
[self.button setBackgroundImage:[UIImage ImageName:@“button_sm”]
forState:uicontrol状态正常]；
[self.button setBackgroundImage:[UIImage ImageName:@“按钮按下”]
forState:uicontrol状态突出显示]；
self.button.autoresizingMask=UIViewAutoresizingFlexibleHeight | uiviewautoresizingflexibleleleftmargin；
self.button.hidden=！\u showButton；
self.rightView=self.button；
}
-（void）drawRect:（CGRect）rect
{
self.backgroundView.frame=CGRectMake（self.bounds.origin.x，
自界，原点，y，
self.bounds.size.width-1，//如果没有此选项，背景从按钮伸出1磅
自限、大小、高度）；
[self.backgroundView drawRect:rect]；
}
-（id）副本
{
SearchTextField*copy=[[self.class alloc]initWithFrame:self.frame]；
copy.text=self.text；
copy.textAlignment=self.textAlignment；
copy.textColor=self.textColor；
copy.placeholder=self.placeholder；
copy.background=self.background；
copy.backgroundColor=self.backgroundColor；
copy.borderStyle=self.borderStyle；
copy.font=self.font；
copy.showButton=self.showButton；
copy.title=self.title；
copy.delegate=self.delegate；
copy.secureTextEntry=self.secureTextEntry；
copy.returnKeyType=self.returnKeyType；
copy.keyboardType=self.keyboardType；
返回副本；
}
#pragma标记-UITextField定位-
-（CGRect）textRectForBounds：（CGRect）bounds
{
CGSize labelSize=[self.label.text sizeWithFont:self.label.font constrainedToSize:CGSizeMake（最大标签宽度，边界.大小.高度）]；
cgsizetextsize=[@“测试”大小：self.font]；
CGRect rect=CGRectMake（10+labelSize.width，
（bounds.size.height text size.height）/2，
bounds.size.width-（20+labelSize.width+（（self.showButton）？按钮宽度：0）），
文本大小、高度）；
返回矩形；
}
-（CGRect）占位符rectforbounds：（CGRect）bounds
{
返回[self-textRectForBounds:bounds]；
}
-（CGRect）编辑rectforbounds：（CGRect）bounds
{
返回[self-textRectForBounds:bounds]；
}
-（CGRect）leftViewRectForBounds：（CGRect）bounds
{
返回CGRectMake（10，
0,
[self.label.text sizeWithFont:self.label.font constrainedToSize:CGSizeMake（最大标签宽度，边界.大小.高度）].WIDTH，
边界、大小、高度）；
}
-（CGRect）rightViewRectForBounds:（CGRect）bounds
{
如果（！self.showButton）{return CGRectZero；}
返回CGRectMake（bounds.size.width-BUTTON_width，
0,
按钮宽度，
边界、大小、高度）；
}
#布拉格标记-
-（void）setTitle:（NSString*）标题
{
[_标题发布]；
_所有权=[所有权保留]；
self.label.text=标题；
[self-setNeedsLayout]；
}
-（UIImage*）imageForState:（UIControlState）状态
{
返回[self.button imageForState:state]；
}
-（void）设置图像：（UIImage*）图像状态：（UIControlState）状态
{
[self.button setImage:image for state:state]；
}
-（无效）添加目标：（id）目标操作：（SEL）controlEvents的操作：（uicontrol事件）controlEvents
{
[self.button addTarget:target action:action for controlEvents:controlEvents]；
}
-（无效）设置显示按钮：（BOOL）显示按钮
{
self.button.hidden=！showButton；
_showButton=showButton；
[self-setNeedsLayout]；
}
-（MyView*）背景视图
{
[自我设置需要显示]；
返回我的背景视图；
}
-（无效）交易
- (CGRect)textRectForBounds:(CGRect)bounds
{
    CGRect rect ;
    rect = [super textRectForBounds:bounds];
    NSLog(@"REAL textRectForBounds %@", NSStringFromCGRect(rect) );

    CGSize labelSize = [self.label.text sizeWithFont:self.label.font constrainedToSize:CGSizeMake(MAX_LABEL_WIDTH, bounds.size.height)];
    CGSize textSize = [@"Test" sizeWithFont:self.font]; 

    NSLog(@"labelSize=%@ textSize=%@ bounds=%@", NSStringFromCGSize(labelSize), NSStringFromCGSize(textSize), NSStringFromCGRect(bounds));

    rect = CGRectMake(10 + labelSize.width,
                      (bounds.size.height-textSize.height)/2,
                      bounds.size.width - (20 + labelSize.width + ((self.showButton) ? BUTTON_WIDTH : 0)),
                      textSize.height);

NSLog(@"%@: textRectForBounds %@", type, NSStringFromCGRect(rect) );
    return rect;
}

labelSize={0, 100} textSize={28, 18} bounds={{0, 0}, {100, 100}}
textRectForBounds {{10, 41}, {80, 18}}