通过UITextView中的UiBarButtonItem更改字体大小，仅工作一次 [英] Change font size via UiBarButtonItem in UITextView, works just once

问题描述

我有UiTextView，我想在其中更改字体大小(增加)，此处为代码

I have UiTextView where I want change font size (increase), here code

-(void)biggerFont:(UIBarButtonItem *) item {
    CGFloat i = [UIFont systemFontSize];
    textView.font = [UIFont fontWithName:@"Tahome" size:i];
    i+=2;    
}

但是它只工作一次，如果您再按一次又一次-fon大小不会改变.请帮助我

But it works just once, if you push once and after that again - fon size won't change. Help me please

推荐答案

很容易，您无需持久保存i的状态.每当您将i设置为相同的值时.方法执行完后，i将被丢弃，因为它仅存在于方法范围内.

It's easy you are not saving the state of i persistently. Everytime you set i to the same value. After the method has been run through i is discarded cause it only exists in the methods scope.

将i更改为类似的属性

CGFloat myFontSize;

@property(nonatomic) CGFloat myFontSize;

例如，在viewWillLoad中设置默认值

For example in the viewWillLoad you set the default value

self.myFontSize = [UIFont systemFontSize];

您的方法更改为

-(void)biggerFont:(UIBarButtonItem *) item 
{
    myFontSize += 2;
    textView.font = [UIFont fontWithName:@"Tahome" size:myFontSize];
}

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