在ios中设置UINavigationitem（Leftbarbutton项）的图像

我正在尝试使用下面的代码为UIBarButtonItem设置图像。但它在导航栏中显示为空白图像。请帮我解决这个问题。我对ios完全陌生

[self.navigationController.navigationBar setTintColor:[UIColor whiteColor]];
[self.navigationController.navigationBar setBarTintColor:[UIColor colorWithRed:38.0/255.0 green:126.0/255.0 blue:202.0/255.0 alpha:0.5]];
UIBarButtonItem *lftbarbtn = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"Cross_Icon.png"] style:UIBarButtonItemStyleBordered target:self action:@selector(additem)];
[self.navigationItem setLeftBarButtonItem:lftbarbtn];

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提前感谢您……

您不需要直接使用导航栏。使用当前视图控制器的导航项属性设置UIBarButtomItems。确保您实际使用的是navigationController来设置这些属性。

您不需要直接使用导航栏。使用当前视图控制器的导航项属性设置UIBarButtomItems。确保您实际使用的是navigationController来设置这些属性。

您不需要直接使用导航栏。使用当前视图控制器的导航项属性设置UIBarButtomItems。确保您实际使用的是navigationController来设置这些属性。

您不需要直接使用导航栏。使用当前视图控制器的导航项属性设置UIBarButtomItems。确保您实际使用的是navigationController来设置这些属性

 UIBarButtonItem *leftBarButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStyleBordered target:self action:@selector(popToBack)];      //create the left bar button

 self.navigationItem.leftBarButtonItem = leftBarButton;   //assign into navigation item

 self.navigationItem.leftBarButtonItem.tintColor=[UIColor colorWithRed:125.0/255.0 green:90.0/255.0 blue:146.0/255.0 alpha:1];   //set the tint color

 [leftBarButton setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys: [UIColor purpleColor],  UITextAttributeTextColor,nil] forState:UIControlStateNormal];    //text color


-(void)popToBack
{
[self.navigationController popToRootViewControllerAnimated:YES];
 }

另一种选择

UIButton *leftbutton =  [UIButton buttonWithType:UIButtonTypeCustom];
[leftbutton setImage:[UIImage imageNamed:@"image.png"] forState:UIControlStateNormal];
[leftbutton addTarget:target action:@selector(buttonAction)forControlEvents:UIControlEventTouchUpInside];
[leftbutton setFrame:CGRectMake(0, 0, 53, 31)];
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(3, 5, 50, 20)];
[label setFont:[UIFont fontWithName:@"Arial-BoldMT" size:13]];
[label setText:title];
label.textAlignment = UITextAlignmentCenter;
[label setTextColor:[UIColor whiteColor]];
[label setBackgroundColor:[UIColor clearColor]];
[leftbutton addSubview:label];
UIBarButtonItem *barButton = [[UIBarButtonItem alloc] initWithCustomView: leftbutton];
self.navigationItem.leftBarButtonItem = barButton;

-(void) buttonAction
{
[self.navigationController popToRootViewControllerAnimated:YES];
 }

另一种选择

UIButton *leftbutton =  [UIButton buttonWithType:UIButtonTypeCustom];
[leftbutton setImage:[UIImage imageNamed:@"image.png"] forState:UIControlStateNormal];
[leftbutton addTarget:target action:@selector(buttonAction)forControlEvents:UIControlEventTouchUpInside];
[leftbutton setFrame:CGRectMake(0, 0, 53, 31)];
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(3, 5, 50, 20)];
[label setFont:[UIFont fontWithName:@"Arial-BoldMT" size:13]];
[label setText:title];
label.textAlignment = UITextAlignmentCenter;
[label setTextColor:[UIColor whiteColor]];
[label setBackgroundColor:[UIColor clearColor]];
[leftbutton addSubview:label];
UIBarButtonItem *barButton = [[UIBarButtonItem alloc] initWithCustomView: leftbutton];
self.navigationItem.leftBarButtonItem = barButton;

-(void) buttonAction
{
[self.navigationController popToRootViewControllerAnimated:YES];
 }

另一种选择

UIButton *leftbutton =  [UIButton buttonWithType:UIButtonTypeCustom];
[leftbutton setImage:[UIImage imageNamed:@"image.png"] forState:UIControlStateNormal];
[leftbutton addTarget:target action:@selector(buttonAction)forControlEvents:UIControlEventTouchUpInside];
[leftbutton setFrame:CGRectMake(0, 0, 53, 31)];
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(3, 5, 50, 20)];
[label setFont:[UIFont fontWithName:@"Arial-BoldMT" size:13]];
[label setText:title];
label.textAlignment = UITextAlignmentCenter;
[label setTextColor:[UIColor whiteColor]];
[label setBackgroundColor:[UIColor clearColor]];
[leftbutton addSubview:label];
UIBarButtonItem *barButton = [[UIBarButtonItem alloc] initWithCustomView: leftbutton];
self.navigationItem.leftBarButtonItem = barButton;

-(void) buttonAction
{
[self.navigationController popToRootViewControllerAnimated:YES];
 }

另一种选择

UIButton *leftbutton =  [UIButton buttonWithType:UIButtonTypeCustom];
[leftbutton setImage:[UIImage imageNamed:@"image.png"] forState:UIControlStateNormal];
[leftbutton addTarget:target action:@selector(buttonAction)forControlEvents:UIControlEventTouchUpInside];
[leftbutton setFrame:CGRectMake(0, 0, 53, 31)];
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(3, 5, 50, 20)];
[label setFont:[UIFont fontWithName:@"Arial-BoldMT" size:13]];
[label setText:title];
label.textAlignment = UITextAlignmentCenter;
[label setTextColor:[UIColor whiteColor]];
[label setBackgroundColor:[UIColor clearColor]];
[leftbutton addSubview:label];
UIBarButtonItem *barButton = [[UIBarButtonItem alloc] initWithCustomView: leftbutton];
self.navigationItem.leftBarButtonItem = barButton;

-(void) buttonAction
{
[self.navigationController popToRootViewControllerAnimated:YES];
 }

---

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你确定你的代码没有问题吗。我认为问题在于你的形象名称。检查一下。图像名称很好。我使用下面的代码实现了输出。UIImage*img=[UIImage ImageName:@“Cross_Icon.png”]；UIButton*btn=[UIButton按钮类型：UIButtonTypeCustom]；btn.frame=CGRectMake（0,0，img.size.width，img.size.height）；[btn setBackgroundImage:img for状态：uicontrol状态正常]；[btn addTarget:self action:@selector（Cancelaction）for ControlEvents:UIControlEventTouchUpInside]；uibarbuttoneim*lftbtn=[[uibarbuttoneim alloc]initWithCustomView:btn]；self.navigationItem.leftBarButtonItem=lftbtn；但是任何人都可以解释为什么不能使用UIBarButtonItem*lftbtn=[[UIBarButtonItem alloc]initWithImage:img样式：uiBarbuttonItemStyleBordedTarget:self action:@selector（cancelaction）]；self.navigationItem.leftBarButtonItem=lftbtn；你确定你的代码没有问题吗。我认为问题在于你的形象名称。检查一下。图像名称很好。我使用下面的代码实现了输出。UIImage*img=[UIImage ImageName:@“Cross_Icon.png”]；UIButton*btn=[UIButton按钮类型：UIButtonTypeCustom]；btn.frame=CGRectMake（0,0，img.size.width，img.size.height）；[btn setBackgroundImage:img for状态：uicontrol状态正常]；[btn addTarget:self action:@selector（Cancelaction）for ControlEvents:UIControlEventTouchUpInside]；uibarbuttoneim*lftbtn=[[uibarbuttoneim alloc]initWithCustomView:btn]；self.navigationItem.leftBarButtonItem=lftbtn；但是任何人都可以解释为什么不能使用UIBarButtonItem*lftbtn=[[UIBarButtonItem alloc]initWithImage:img样式：uiBarbuttonItemStyleBordedTarget:self action:@selector（cancelaction）]；self.navigationItem.leftBarButtonItem=lftbtn；你确定你的代码没有问题吗。我认为问题在于你的形象名称。检查一下。图像名称很好。我使用下面的代码实现了输出。UIImage*img=[UIImage ImageName:@“Cross_Icon.png”]；UIButton*btn=[UIButton按钮类型：UIButtonTypeCustom]；btn.frame=CGRectMake（0,0，img.size.width，img.size.height）；[btn setBackgroundImage:img for状态：uicontrol状态正常]；[btn addTarget:self action:@selector（Cancelaction）for ControlEvents:UIControlEventTouchUpInside]；uibarbuttoneim*lftbtn=[[uibarbuttoneim alloc]initWithCustomView:btn]；self.navigationItem.leftBarButtonItem=lftbtn；但是任何人都可以解释为什么不能使用UIBarButtonItem*lftbtn=[[UIBarButtonItem alloc]initWithImage:img样式：uiBarbuttonItemStyleBordedTarget:self action:@selector（cancelaction）]；self.navigationItem.leftBarButtonItem=lftbtn；你确定你的代码没有问题吗。我认为问题在于你的形象名称。检查一下。图像名称很好。我使用下面的代码实现了输出。UIImage*img=[UIImage ImageName:@“Cross_Icon.png”]；UIButton*btn=[UIButton按钮类型：UIButtonTypeCustom]；btn.frame=CGRectMake（0,0，img.size.width，img.size.height）；[btn setBackgroundImage:img for状态：uicontrol状态正常]；[btn addTarget:self action:@selector（Cancelaction）for ControlEvents:UIControlEventTouchUpInside]；uibarbuttoneim*lftbtn=[[uibarbuttoneim alloc]initWithCustomView:btn]；self.navigationItem.leftBarButtonItem=lftbtn；但是任何人都可以解释为什么不能使用UIBarButtonItem*lftbtn=[[UIBarButtonItem alloc]initWithImage:img样式：uiBarbuttonItemStyleBordedTarget:self action:@selector（cancelaction）]；self.navigationItem.leftBarButtonItem=lftbtn；谢谢你的回复。但是我只使用当前视图控制器的导航项属性。这里我的当前视图控制器是EmployeeListTableViewController。我已将其指定为应用程序委托中UINavigationController的根视图控制器。感谢您的响应。但是我只使用当前视图控制器的导航项属性。这里我的当前视图控制器是EmployeeListTableViewController。我已将其指定为应用程序委托中UINavigationController的根视图控制器。感谢您的响应。但是我只使用当前视图控制器的导航项属性。这里我的当前视图控制器是EmployeeListTableViewController。我已将其指定为应用程序委托中UINavigationController的根视图控制器。感谢您的响应。但我使用的是当前的视图控件