Question

我的应用程序在viewDidLoad方法中加载时会创建几个UITextView，因为我需要在应用程序启动时创建它们，以便能够在视图之间滚动并让它们随滚动视图一起滑动。我尝试创建一个UIButton，并为其分配更改UITextView内文本字体大小的功能。但是，由于它是在viewDidLoad方法中以编程方式创建的，因此无法访问它们，因此没有任何反应。我试图通过使用故事板创建UITextViews，但没有得到所需的结果，所以我不能改变我的创建方法。此外，当我按下按钮时调用viewDidLoad方法是不合逻辑的，因为它中定义了许多方法，每次我需要更改字体大小时，它会耗尽CPU功率来调用它。以下是我创建UITextViews的方法：

- (void)viewDidLoad {


    CGSize imageSize;
    imageSize.height = 693;
    imageSize.width = 512;
    self.scroll1.minimumZoomScale = 1.0;
    self.scroll1.maximumZoomScale = 1.0;
    self.scroll1.frame = CGRectMake(0,0,imageSize.width,imageSize.height);
    self.scroll1.scrollEnabled = YES;
    self.scroll1.contentSize = CGSizeMake(imageSize.width * imgs.count, imageSize.height );
    self.scroll1.pagingEnabled = YES;
    self.scroll1.bounces = false;
    self.scroll1.delegate = self;
    leftTextFieldsArray=[NSMutableArray array];
    rightTextFieldsArray=[NSMutableArray array];
    int counter = 0 ;
    for (int i = 0; i <= pants - 2; i ++)
    {

        CGFloat x = counter * 1024;
        subView = [[UIScrollView alloc]initWithFrame:CGRectMake(x, 0, 1024, 693)];
        subView.clipsToBounds = NO;

        UIImage *img;
        UIImage *img2;


        img = [imgs objectAtIndex:i];
        img2 = [imgs objectAtIndex:i+1];


        imageView = [[UIImageView alloc ] initWithImage:img];
        imageView.frame = CGRectMake(i * 512, 0, 512, 693);
        imageView2 = [[UIImageView alloc ] initWithImage:img2];
        imageView2.frame = CGRectMake((i+1) * 512, 0, 512, 693);

///////////// ///////////// ///////////// TextViews Created///////////// ///////////// 
        rightTextView = [[UITextView alloc]init];
        leftTextView = [[UITextView alloc]init];

        rightTextView.scrollEnabled = YES;
        leftTextView.scrollEnabled = YES;
        rightTextView.editable = NO;
            leftTextView.editable = NO;
//////////////////////////////Specific Behavior regarding positioning in each view//////////

        if(i == 4) {
            leftTextView.frame = CGRectMake(2048, 0, 500,300);
        }
        else if(i == 6){
            leftTextView.frame = CGRectMake(3072, 450, 500,300);
            rightTextView.frame = CGRectMake(3584, 0, 500,200);
            rightTextView.layer.zPosition = 2;
        }
        else if(i==8){
            leftTextView.frame = CGRectMake(4096, 0, 500,300);
            rightTextView.frame = CGRectMake(4608, 450, 500,300);
        rightTextView.layer.zPosition = 2;
        }
        else if(i==10){
            leftTextView.frame = CGRectMake(5120, 0, 500,300);
            rightTextView.frame = CGRectMake(5632, 0, 500,300);
            rightTextView.layer.zPosition = 2;
        }
        else if(i==12){
            leftTextView.frame = CGRectMake(6144, 0, 500,300);
            rightTextView.frame = CGRectMake(6656, 450, 500,300);
            rightTextView.layer.zPosition = 2;
        }
        else if(i==14) {
            leftTextView.frame = CGRectMake(7168, 450, 500,300);
            rightTextView.frame = CGRectMake(7680, 0, 500,300);
            rightTextView.layer.zPosition = 2;

        }

        else if(i==16) {
            leftTextView.frame = CGRectMake(8192, 0, 500,300);
            rightTextView.frame = CGRectMake(8674, 0, 500,300);
            rightTextView.layer.zPosition = 2;
        }
        else if(i==18){
            leftTextView.frame = CGRectMake(9216, 450, 500,300);
            rightTextView.frame = CGRectMake(9728, 0, 500,300);
            rightTextView.layer.zPosition = 2;

        }
        else if(i==20){
            leftTextView.frame = CGRectMake(10240, 450, 500,300);
            rightTextView.frame = CGRectMake(10752, 450, 500,300);
            rightTextView.layer.zPosition = 2;
        }
        else if(i==22){
            leftTextView.frame = CGRectMake(11264, 0, 500,300);
            rightTextView.frame = CGRectMake(11776, 0, 500,300);
            rightTextView.layer.zPosition = 2;
        }
        rightTextView.backgroundColor = [UIColor clearColor];
        rightTextView.textColor = [UIColor blackColor];

        rightTextView.text = rightArray[i/2];

        [rightTextFieldsArray addObject:rightTextView];

            leftTextView.backgroundColor = [UIColor clearColor];
            leftTextView.textColor = [UIColor blackColor];

            leftTextView.text = leftArray[i/2];

            [leftTextFieldsArray addObject:leftTextView];


        subView.scrollEnabled = NO;

        subView.userInteractionEnabled = NO;


        [subView addSubview:imageView];

        [imageView2 removeFromSuperview];

        [subView addSubview:leftTextView];

        [self.scroll1 addSubview:rightTextView];
        [self.scroll1 addSubview:subView];



    }



    counter ++;
    [super viewDidLoad];
  }

我在Button中尝试了这个方法：

- (IBAction)increaseFontFun:(id)sender {
    [leftTextView setFont:[UIFont boldSystemFontOfSize:24.0f]];
}

所以没有结果没有结果。我怎样才能达到目的？非常感谢

Answer 1

从您提供的代码中，increaseFontFun: leftTextView将引用UItextView方法中创建的最后一个viewDidLoad。

我不确定我是否理解正确，但是如果你想要改变所有UITextViews的字体大小，你应该遍历leftTextFieldsArray并为每个字体设置字体，或者使用NSArray的方法makeObjectsPerformSelector:withObject:

这是一个示例

for(UITextView * textView in leftTextFieldsArray){
    textView.font = [UIFont boldSystemFontOfSize:12];
}

Answer 2

你可以做到这很简单：

UITextField *field = [[UITextField alloc] init];
field.font = [UIFont fontWithName:@"ArialMT" size:50.0f];

Answer 3

你的代码......

    leftTextView = [[UITextView alloc]init];

    rightTextView.scrollEnabled = YES;
    leftTextView.scrollEnabled = YES;
    rightTextView.editable = NO;
        leftTextView.editable = NO;

    if(i == 4) {
        leftTextView.frame = CGRectMake(2048, 0, 500,300);
    }
    else if(i == 6){
        leftTextView.frame = CGRectMake(3072, 450, 500,300);
        rightTextView.frame = CGRectMake(3584, 0, 500,200);
        rightTextView.layer.zPosition = 2;
    }

    ......

从NSLog中你已经设置了textview的框架是0,0,0,0因此无法看到。您需要添加一些初始化，其中包含i可能不是您期望的值之一的事实

更改在ViewDidLoad中以编程方式创建的TextView的字体大小

3 个答案: