我有一个这样的自定义类：
@interface formParser : NSObject <UITextFieldDelegate> {
....
在 .m 中，我创建了一个 UITextField 元素，如下所示：
UITextField *ui = [[UITextField alloc] initWithFrame:CGRectMake(left, top, width, height)];
[ui setDelegate:self];
[ui setPlaceholder:[dict_elementInfo objectForKey:@"placeholder"]];
[ui setBorderStyle:UITextBorderStyleLine];
[view addSubview:ui];
和
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
NSLog(@"should begin");
return NO;
}
我的问题是 shouldbegin 永远不会被调用。当我在“普通” UIViewController 类上尝试这种技术时，它工作得很好，但是在我的自定义对象中这样做它从来没有调用过。任何人都可以找出原因吗？
我的自定义类调用如下：
formParser *fParse = [[formParser alloc] init];
UIView *view_formBackground = [fParse viewOfPlist:@"form" initSize:CGRectMake(0, 0, scrollView.contentSize.width, scrollView.contentSize.height)];
view_formBackground.backgroundColor = [UIColor whiteColor];
//add views to main view
[scrollView addSubview:view_formBackground];
[self.view addSubview:scrollView];
此外，在 formparser.m 中 viewofplist 如下：
-(UIView *)viewOfPlist:(NSString *)filename initSize:(CGRect)size
{
ypos_element_left = 40; ypos_element_right = 40;
view = [[UIView alloc] initWithFrame:size];
//load plist
NSString *path = [[NSBundle mainBundle] pathForResource:filename ofType:@"plist"];
NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:path];
rootArray = [dict objectForKey:@"form"];
//loop door alle UI entries in de dict.
for (NSDictionary *dict_UIElement in rootArray)
{
NSString *UIType = [dict_UIElement objectForKey:@"type"];
if ([UIType isEqualToString:@"ui_empty"]) [self handle_uiempty:dict_UIElement];
if ([UIType isEqualToString:@"ui_multiselect"]) [self handle_uimultiselect:dict_UIElement];
if ([UIType isEqualToString:@"ui_label"]) [self handle_uilabel:dict_UIElement];
if ([UIType isEqualToString:@"ui_textfield"]) [self handle_uitextfield:dict_UIElement];
if ([UIType isEqualToString:@"ui_choicefield"]) [self handle_uichoicefield:dict_UIElement];
if ([UIType isEqualToString:@"ui_calendar"]) [self handle_uicalendar:dict_UIElement];
}
return (view);
}
谢谢回答！