Swift环境下实现UILabel居上 居中 居下对齐

概述首先在Xcode中新建.h文件，将以下代码复制进去 //// myUILabel.h// //// Created by yexiaozi_007 on 3/4/13.// Copyright (c) 2013 yexiaozi_007. All rights reserved.//#import <UIKit/UIKit.h>typedef enum{ Ver

首先在Xcode中新建.h文件，将以下代码复制进去

////  myUILabel.h//  ////  Created by yexiaozi_007 on 3/4/13.//  copyright (c) 2013 yexiaozi_007. All rights reserved.//#import <UIKit/UIKit.h>typedef enum{    VerticalAlignmenttop = 0,// default    VerticalAlignmentMIDdle,VerticalAlignmentBottom,} VerticalAlignment;@interface myUILabel : UILabel{@privateVerticalAlignment _verticalAlignment;}@property (nonatomic) VerticalAlignment verticalAlignment;@end

再新建一个.m文件，拷入以下代码

////  myUILabel.m//  ////  Created by yexiaozi_007 on 3/4/13.//  copyright (c) 2013 yexiaozi_007. All rights reserved.//#import "myUILabel.h"@implementation myUILabel@synthesize verticalAlignment = verticalAlignment_;- (ID)initWithFrame:(CGRect)frame {    if (self = [super initWithFrame:frame]) {        self.verticalAlignment = VerticalAlignmentMIDdle;    }    return self;}- (voID)setVerticalAlignment:(VerticalAlignment)verticalAlignment {    verticalAlignment_ = verticalAlignment;    [self setNeedsdisplay];}- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOflines:(NSInteger)numberOflines {    CGRect textRect = [super textRectForBounds:bounds limitedToNumberOflines:numberOflines];    switch (self.verticalAlignment) {        case VerticalAlignmenttop:            textRect.origin.y = bounds.origin.y;            break;        case VerticalAlignmentBottom:            textRect.origin.y = bounds.origin.y + bounds.size.height - textRect.size.height;            break;        case VerticalAlignmentMIDdle:            // Fall through.        default:            textRect.origin.y = bounds.origin.y + (bounds.size.height - textRect.size.height) / 2.0;    }    return textRect;}-(voID)drawTextInRect:(CGRect)requestedRect {    CGRect actualRect = [self textRectForBounds:requestedRect limitedToNumberOflines:self.numberOflines];    [super drawTextInRect:actualRect];}@end

如果这是你导入的第一个.m文件Xcode会提示你要不要创建BrIDging-header，选Ok

在新创建的BrIDging-header文件里拷入下方代码

#import "myUILabel.h"

然后打开你的StoryBoard，点选你想要更改对齐方式的Label，将其Class改为myUILabel，示意图如下

然后右键拖动Label或者按住Control键左键拖动连线到Label所在的父VIEw的Class中生成Outlet，如果之前已经连线好，则改完Custom Class后，将连线生成代码中的UILabel改为myUILabel，示意图如下

然后就可以调用该label的类方法

label.verticalAlignment = VerticalAlignmentBottom

按上方代码可以实现居下对其，居中 居上 分别将代码中的Bottom改为MIDdle和top，默认为居上 总结

以上是内存溢出为你收集整理的Swift环境下实现UILabel居上 居中 居下对齐全部内容，希望文章能够帮你解决Swift环境下实现UILabel居上 居中 居下对齐所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。