我有一个 UILabel
,其属性 text
我想使用 NSString
设置文本段落。
我有一个数组,其中存储代表文本段落的字符序列。
该段落不必完全适合/包含在这个 UILabel
中。如果该段落没有结束,我将转到下一个标签。
假设我的 UILabel
的矩形大小为 160 X 240,我如何才能确定正确的字体大小以填充 UILabel
的字符串> 里面很好吗?
是否有一种数学方法可以根据屏幕上矩形的大小来计算字体大小?
例如:
UILabel *aLabel = [[UIlabel alloc] initwithFrame(CGRect){{0, 0}, 160, 240}];
aLabel.font = [UIFont fontWithName:@"Courier New" size:<???>]; //(font unit in points)
NSMutableString *aString = [[NSMutableString alloc] init];
//The following tries to fit the character one by one within the label rect based on
//the width and height of the UILabel by appending String
int index = 0;
for(int x = 0; x < 240; x+=<???>) //height of label (pixel unit)
{
for(int y = 0; y < 160; y+=<???>) //width of label (pixel unit)
{
[aString appendWithString:[paragraphArray objectAtIndex:index]];
index++;
}
[aString appendWithString:@\n"]; //line break
}
aLabel.text = aString;
我怎样才能确定 ??? 的值?是(即 for 循环的字体大小和像素大小)?
如果这不是执行此类任务的最佳方式,请向我建议其他方式。
最佳答案
+(void)resizeFontForLabel:(UILabel*)aLabel{
// use font from provided label so we don't lose color, style, etc
UIFont *font = aLabel.font;
float lblWidth = aLabel.frame.size.width;
float lblHeight = aLabel.frame.size.height;
CGFloat fontSize = [font pointSize];
UIFont *newFont = font;
TRC_DBG(@"%@", aLabel.text);
CGFloat height = [aLabel.text sizeWithFont:font constrainedToSize:CGSizeMake(lblWidth,MAXFLOAT) lineBreakMode:aLabel.lineBreakMode].height;
TRC_DBG(@"Label Height %f Constraint height %f", lblHeight, height);
//Reduce font size while too large, break if no height (empty string)
while (height > lblHeight && height != 0) {
fontSize--;
newFont = [UIFont fontWithName:font.fontName size:fontSize];
height = [aLabel.text sizeWithFont:newFont constrainedToSize:CGSizeMake(lblWidth,MAXFLOAT) lineBreakMode:NSLineBreakByWordWrapping].height;
TRC_DBG(@"Constrained Height %f", height);
};
TRC_DBG(@"Font size before adjustment %f", aLabel.font.pointSize);
// Set the UILabel's font to the newly adjusted font.
aLabel.font = newFont;
TRC_DBG(@"Adjust to font size of %f", newFont.pointSize);
[aLabel setNeedsLayout];
}
关于iOS:根据 UILabel 的大小找到正确的字体大小以适合其大小,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21751738/