Question

我有UITextField的名字_nameField 我想通过@Selector（）传递_nameField.text到

 -(void)userSetStats:(NSString *)name{

这是我的Uitextfield

_nameField = [[UITextField alloc]initWithFrame:CGRectMake(self.view.frame.size.height/2-100, self.view.frame.size.width/2-20, 200, 40)];
_nameField.delegate = self;
[self.view addSubview:_nameField];

这是我的按钮

UIButton *confirm = [[UIButton alloc]initWithFrame:CGRectMake(self.view.frame.size.height/2-50, self.view.frame.size.width/2+60, 100, 40)];
[confirm setTitle:@"Confirm" forState:UIControlStateNormal];
[confirm addTarget:self action:@selector(userSetStats:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:confirm];

这是我的userSetStats：

-(void)userSetStats:(NSString *)name{
NSMutableDictionary *userData = [[NSMutableDictionary alloc]init];
[userData setObject:name forKey:@"Name"];

现在我可以发送价值，但我得到的价值是

Name = "<UIButton: 0x9a2ddd0; frame = (190 220; 100 40); opaque = NO; layer = <CALayer: 0x9a2df00>>";

我试着在这个网站上找到任何答案我找到了一些，但我不明白。

Answer 1

addTarget的选择器只能是发件人。在这种情况下，您不需要参数。

[confirm addTarget:self action:@selector(userSetStats) forControlEvents:UIControlEventTouchUpInside];

，选择器是......

-(void)userSetStats
{
    NSMutableDictionary *userData = [[NSMutableDictionary alloc]init];
    [userData setObject:_nameField.text forKey:@"Name"];
}

Answer 2

Action methods in iOS具有以下形式：

- (IBAction)doSomething:(id)sender;
- (IBAction)action:(id)sender forEvent:(UIEvent *)event;

sender是触发操作的控件。因此：

-(void)userSetStats:(id)sender {

    NSMutableDictionary *userData = [[NSMutableDictionary alloc]init];

如果你想要（发送）按钮的标题，那么：

    UIButton *button = (UIButton *)sender;
    [userData setObject:button.title forKey:@"Name"];

否则如果你想要文本字段中的文本，那么：

    [userData setObject:_nameField.text forKey:@"Name"];

将值从Textfield传递给选择器

2 个答案: