-(void)initUserInterface
{
UILabel *label = [[UILabel alloc]init];
label.numberOfLines = 0; // 需要把显示行数设置成无限制
label.font = [UIFont systemFontOfSize:15];
label.textAlignment = NSTextAlignmentCenter;
label.text = @"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
CGSize size = [self sizeWithString:label.text font:label.font];
label.bounds = CGRectMake(0, 0, size.width, size.height);
label.center = self.view.center;
[self.view addSubview:label];
}
// 定义成方法方便多个label调用 增加代码的复用性
-(CGSize)sizeWithString:(NSString *)string font:(UIFont *)font
{
CGRect rect = [string boundingRectWithSize:CGSizeMake(320, 8000)//限制最大的宽度和高度
options:NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesFontLeading |NSStringDrawingUsesLineFragmentOrigin//采用换行模式
attributes:@{NSFontAttributeName: font}//传人的字体字典
context:nil];
return rect.size;
}
方法二:
CGRect contentRect = [NSString heightForString:badgeValue Size:contentSize Font:kValueFont];
//获取某固定文本的显示高度
+(CGRect)heightForString:(NSString*)str Size:(CGSize)size Font:(UIFont*)font
{
return [NSString heightForString:str Size:size Font:font Lines:0];
}
+(CGRect)heightForString:(NSString*)str Size:(CGSize)size Font:(UIFont*)font Lines:(NSInteger)lines
{
if (StringIsNullOrEmpty(str)) {
return CGRectMake(0, 0, 0, 0);
}
static UILabel *lbtext;
if (lbtext==nil) {
lbtext = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, size.width, size.height)];
}else{
lbtext.frame=CGRectMake(0, 0, size.width, size.height);
}
lbtext.font=font;
lbtext.text=str;
lbtext.numberOfLines=lines;
CGRect rect= [lbtext textRectForBounds:lbtext.frame limitedToNumberOfLines:lines];
if(rect.size.height<0)
rect.size.height=0;
if (rect.size.width<0) {
rect.size.width=0;
}
return rect;
}
/**
-
@return 根据字符串的的长度来计算UITextView的高度
*/+(float)heightForString:(NSString *)value fontSize:(float)fontSize andWidth:(float)width
{float height = [[NSString stringWithFormat:@"%@\n",value] boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIFont systemFontOfSize:fontSize],NSFontAttributeName, nil] context:nil].size.height; return height;
}
/**
-
UITextView根据内容自动改变frame
*/-
(void)textViewDidChange:(UITextView *)textView
{[textView flashScrollIndicators]; // 闪动滚动条 static CGFloat maxHeight = 130.0f; CGRect frame = textView.frame; CGSize constraintSize = CGSizeMake(frame.size.width, MAXFLOAT); CGSize size = [textView sizeThatFits:constraintSize]; if (size.height >= maxHeight) { size.height = maxHeight; textView.scrollEnabled = YES; // 允许滚动 } else { textView.scrollEnabled = NO; // 不允许滚动,当textview的大小足以容纳它的text的时候,需要设置scrollEnabed为NO,否则会出现光标乱滚动的情况 } textView.frame = CGRectMake(frame.origin.x, frame.origin.y, frame.size.width, size.height);
}
-
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