设置文本属性后,将重置UITextView样式

Question

我有UITextView *_masterText和之后调用方法setText属性字体正在重置.这是在我更改sdk 7. _masterText之后发生的IBOutlet,全局和属性在storyboard中设置.这只是我或这是一般的SDK错误？

@interface myViewController : UIViewController
{
  IBOutlet UITextView *_masterText;
}

@implementation myViewController

-(void)viewWillAppear:(BOOL)animated
{
    [_masterText setText:@"New text"];
}

Answer 1

坐了几个小时,我发现了这个bug.如果属性"可选"= NO,则在使用setText时将重置字体和fontcolor.

所以打开Selectable ON,错误就消失了.

Answer 2

我遇到了同样的问题(在Xcode 6.1上),当John Cogan的回答对我有用时,我发现用类别扩展UITextView类对我的特定项目来说是一个更好的解决方案.

接口

@interface UITextView (XcodeSetTextFormattingBugWorkaround)
    - (void)setSafeText:(NSString *)textValue;
@end

履行

@implementation UITextView (XcodeSetTextFormattingBugWorkaround)
- (void)setSafeText:(NSString *)textValue
{
    BOOL selectable = [self isSelectable];
    [self setSelectable:YES];
    [self setText:textValue];
    [self setSelectable:selectable];
}
@end

Answer 3

如果您希望文本视图为"只读",则可以选中"可编辑"和"可选择"并取消选中"启用用户交互",这样UITextView的行为就像我想要的那样

Answer 4

有这个问题我自己和上面的答案有帮助,但我添加了一个包装到我的ViewController代码如下,只是传递uiview实例和文本进行更改,包装函数切换可选值,更改文本,然后再将其关闭.默认情况下,您需要在任何时候关闭uitextview.

/*
    We set the text views Selectable value to YES temporarily, change text and turn it off again.
    This is a known bug that if the selectable value = NO the view loses its formatting.
 */
-(void)changeTextOfUiTextViewAndKeepFormatting:(UITextView*)viewToUpdate withText:(NSString*)textValue
{
    if(![viewToUpdate isSelectable]){
        [viewToUpdate setSelectable:YES];
        [viewToUpdate setText:textValue];
        [viewToUpdate setSelectable:NO];
    }else{
        [viewToUpdate setText:textValue];
        [viewToUpdate setSelectable:NO];
    }
}