CATextLayer行数？

问题描述

我的CATextlayer仅支持1行
，否则文本将被剪切。

My CATextlayer support only 1 lineotherwise the text is cut.

试图设置UILabel行为之类的文本内容...有可能吗？

trying to set text content like UILabel Behaviour... is it possible?

1. 设置行数

1. set "number of lines"

调整文本通过静态 CATextLayer框架

adjust text size by static CATextLayer frame

CATextLayer *text_layer= [[CATextLayer alloc] init];
[text_layer setBackgroundColor:[UIColor clearColor].CGColor];
[text_layer setBackgroundColor:[UIColor blueColor].CGColor];
[text_layer setForegroundColor:layers.textColor.CGColor];
[text_layer setAlignmentMode:kCAAlignmentCenter];
[text_layer setBorderColor:layers.borderColor.CGColor];
[text_layer setFrame:CGRectMake(0,0,200,50)]; //note: frame must be static
[text_layer setString:@"thank you for your respond"];
 text_layer.wrapped = YES;
[text_layer setAlignmentMode:kCAAlignmentCenter];

推荐答案

您的问题是这行， [text_layer setFrame：CGRectMake（0,0,200,50）]; 。我认为CATextLayer不会布局以容纳多行。它只会重新绘制文本以包装在图层范围内。尝试根据设置的文本调整文本层的框架。您可以创建一个 UILabel 实例，以计算带有换行的多行文本的框架，并将其设置为您的 CATextLayer

Your problem is this line right here, [text_layer setFrame:CGRectMake(0,0,200,50)];. I don't think a CATextLayer would lay itself out to accommodate multiple lines. It will only re-draw the text to wrap within the layer's bounds. Try adjusting your text layer's frame based on the text being set. You can create a UILabel instance, to calculate the frame for having multiline text with word wrapping and set it to your CATextLayer instance.

这里是 UILabel 类别，用于使用换行计算多行文本的文本大小：

Here's a UILabel category to calculate text size for multiline text with word wrapping:

@interface UILabel (Height)

- (CGSize)sizeForWrappedText;

@end

@implementation UILabel (Height)

- (CGSize)sizeForWrappedText {
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, 0.0f, self.bounds.size.width, CGFLOAT_MAX)];
    label.numberOfLines = 0;
    label.font = self.font;
    label.text = self.text;
    [label sizeToFit];
    return label.frame.size;
}

@end

创建 UILabel 实例，并使用 sizeForWrappedText 来获取大小。像这样：

Create a UILabel instance, and use the sizeForWrappedText to get the size. Something like this:

// Make sure the someFrame here has the preferred width you want for your text_layer instance.
UILabel *label = [[UILabel alloc] initWithFrame:someFrame];
[label setText:@"My awesome text!"];

CGRect frame = text_layer.frame;
frame.size = [label sizeForWrappedText];
[text_layer setFrame:frame];

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