假设我在UILabel中有以下文本(一长行动态文本):
由于外星军队的数量远远超过了团队,玩家必须利用后世界末日的优势,比如在垃圾箱、柱子、汽车、瓦砾和其他物体后面寻找掩护。
我想调整UILabel的高度,这样文本就可以放进去了。我使用以下属性的UILabel,使文本内包装。
myUILabel.lineBreakMode = UILineBreakModeWordWrap;
myUILabel.numberOfLines = 0;
如果我的方向不对,请告诉我。谢谢。
假设我在UILabel中有以下文本(一长行动态文本):
由于外星军队的数量远远超过了团队,玩家必须利用后世界末日的优势,比如在垃圾箱、柱子、汽车、瓦砾和其他物体后面寻找掩护。
我想调整UILabel的高度,这样文本就可以放进去了。我使用以下属性的UILabel,使文本内包装。
myUILabel.lineBreakMode = UILineBreakModeWordWrap;
myUILabel.numberOfLines = 0;
如果我的方向不对,请告诉我。谢谢。
当前回答
对于那些迁移到iOS 8的人,这里有一个Swift的类扩展:
extension UILabel {
func autoresize() {
if let textNSString: NSString = self.text {
let rect = textNSString.boundingRectWithSize(CGSizeMake(self.frame.size.width, CGFloat.max),
options: NSStringDrawingOptions.UsesLineFragmentOrigin,
attributes: [NSFontAttributeName: self.font],
context: nil)
self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y, self.frame.size.width, rect.height)
}
}
}
其他回答
你可以通过以下方式实现TableViewController的(UITableViewCell *)tableView:cellForRowAtIndexPath方法(例如):
#define CELL_LABEL_TAG 1
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *text = @"my long text";
static NSString *MyIdentifier = @"MyIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:identifier] autorelease];
}
CGFloat width = [UIScreen mainScreen].bounds.size.width - 50;
CGFloat height = [self textHeight:text] + 10;
CGRect frame = CGRectMake(10.0f, 10.0f, width, height);
UILabel *cellLabel = [[UILabel alloc] initWithFrame:frame];
cellLabel.tag = CELL_LABEL_TAG;
cellLabel.textColor = [UIColor blackColor];
cellLabel.backgroundColor = [UIColor clearColor];
cellLabel.textAlignment = UITextAlignmentLeft;
cellLabel.font = [UIFont systemFontOfSize:12.0f];
[cell.contentView addSubview:cellLabel];
[cellLabel release];
return cell;
}
UILabel *label = (UILabel *)[cell viewWithTag:CELL_LABEL_TAG];
label.text = text;
label.numberOfLines = 0;
[label sizeToFit];
return cell;
也可以使用NSString的sizeWithFont:constrainedToSize:lineBreakMode:方法来计算文本的高度。
我计算UILabel动态高度的方法。
let width = ... //< width of this label
let text = ... //< display content
label.numberOfLines = 0
label.lineBreakMode = .byWordWrapping
label.preferredMaxLayoutWidth = width
// Font of this label.
//label.font = UIFont.systemFont(ofSize: 17.0)
// Compute intrinsicContentSize based on font, and preferredMaxLayoutWidth
label.invalidateIntrinsicContentSize()
// Destination height
let height = label.intrinsicContentSize.height
包装功能:
func computeHeight(text: String, width: CGFloat) -> CGFloat {
// A dummy label in order to compute dynamic height.
let label = UILabel()
label.numberOfLines = 0
label.lineBreakMode = .byWordWrapping
label.font = UIFont.systemFont(ofSize: 17.0)
label.preferredMaxLayoutWidth = width
label.text = text
label.invalidateIntrinsicContentSize()
let height = label.intrinsicContentSize.height
return height
}
iOS7之前和iOS7上面的解决方案
//
// UILabel+DynamicHeight.m
// For StackOverFlow
//
// Created by Vijay on 24/02/14.
// Copyright (c) 2014 http://Vijay-Apple-Dev.blogspot.com. All rights reserved.
//
#import <UIKit/UIKit.h>
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
#define iOS7_0 @"7.0"
@interface UILabel (DynamicHeight)
/*====================================================================*/
/* Calculate the size,bounds,frame of the Multi line Label */
/*====================================================================*/
/**
* Returns the size of the Label
*
* @param aLabel To be used to calculte the height
*
* @return size of the Label
*/
-(CGSize)sizeOfMultiLineLabel;
@end
//
// UILabel+DynamicHeight.m
// For StackOverFlow
//
// Created by Vijay on 24/02/14.
// Copyright (c) 2014 http://Vijay-Apple-Dev.blogspot.com. All rights reserved.
//
#import "UILabel+DynamicHeight.h"
@implementation UILabel (DynamicHeight)
/*====================================================================*/
/* Calculate the size,bounds,frame of the Multi line Label */
/*====================================================================*/
/**
* Returns the size of the Label
*
* @param aLabel To be used to calculte the height
*
* @return size of the Label
*/
-(CGSize)sizeOfMultiLineLabel{
NSAssert(self, @"UILabel was nil");
//Label text
NSString *aLabelTextString = [self text];
//Label font
UIFont *aLabelFont = [self font];
//Width of the Label
CGFloat aLabelSizeWidth = self.frame.size.width;
if (SYSTEM_VERSION_LESS_THAN(iOS7_0)) {
//version < 7.0
return [aLabelTextString sizeWithFont:aLabelFont
constrainedToSize:CGSizeMake(aLabelSizeWidth, MAXFLOAT)
lineBreakMode:NSLineBreakByWordWrapping];
}
else if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(iOS7_0)) {
//version >= 7.0
//Return the calculated size of the Label
return [aLabelTextString boundingRectWithSize:CGSizeMake(aLabelSizeWidth, MAXFLOAT)
options:NSStringDrawingUsesLineFragmentOrigin
attributes:@{
NSFontAttributeName : aLabelFont
}
context:nil].size;
}
return [self bounds].size;
}
@end
NSString *str = @"Please enter your text......";
CGSize lblSize = [str sizeWithFont:[UIFont systemFontOfSize:15] constrainedToSize: CGSizeMake(200.0f, 600.0f) lineBreakMode: NSLineBreakByWordWrapping];
UILabel *label = [[UILabel alloc]init];
label.frame = CGRectMake(60, 20, 200, lblSize.height);
label.numberOfLines = 0;
label.lineBreakMode = NSLineBreakByWordWrapping;
label.font = [UIFont systemFontOfSize:15];
label.text = str;
label.backgroundColor = [UIColor clearColor];
[label sizeToFit];
[self.view addSubview:label];
sizeWithFont constrainedToSize:lineBreakMode:是使用的方法。如何使用它的例子如下:
//Calculate the expected size based on the font and linebreak mode of your label
// FLT_MAX here simply means no constraint in height
CGSize maximumLabelSize = CGSizeMake(296, FLT_MAX);
CGSize expectedLabelSize = [yourString sizeWithFont:yourLabel.font constrainedToSize:maximumLabelSize lineBreakMode:yourLabel.lineBreakMode];
//adjust the label the the new height.
CGRect newFrame = yourLabel.frame;
newFrame.size.height = expectedLabelSize.height;
yourLabel.frame = newFrame;