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        iOS中UILabel設置居上對齊、居中對齊、居下對齊及文字置頂顯示

        2017-12-19 08:28:16

        在iOS中默認的UILabel中的文字在豎直方向上只能居中對齊,博主參考國外網站,從UILabel繼承了一個新類,實現了居上對齊,居中對齊,居下對齊。具體如下:?123456789101112131415161718192021////myUILabel.h//////Createdbyyexiaozi_007on3/4/13.//Copyright(c)2013yexiaozi_007.Allr...

        在iOS中默認的UILabel中的文字在豎直方向上只能居中對齊,博主參考國外網站,從UILabel繼承了一個新類,實現了居上對齊,居中對齊,居下對齊。

        具體如下:

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        //

        // 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

        {

        @private

        VerticalAlignment _verticalAlignment;

        }

        @property (nonatomic) VerticalAlignment verticalAlignment;

        @end

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        //

        // 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

        在使用時:

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        lbl_mylabel = [[myUILabel alloc] initWithFrame:CGRectMake(20, 50, 150, 600)];

        UIColor *color = [UIColor colorWithPatternImage:[UIImage imageNamed:@"halfTransparent.png"]];//使用半透明圖片作為label的背景色

        lbl_mylabel.backgroundColor = color;

        lbl_mylabel.textAlignment = UITextAlignmentLeft;

        lbl_mylabel.textColor = UIColor.whiteColor;

        lbl_mylabel.lineBreakMode = UILineBreakModeWordWrap;

        lbl_mylabel.numberOfLines = 0;

        [lbl_mylabel setVerticalAlignment:VerticalAlignmentTop];

        [self addSubview:lbl_mylabel];

        UILabel 讓文字置頂顯示

        我們經常會遇到將Label中文字置頂,也就是將文字頂到Lable框的最頂端顯示的需求,UILabel是無法對內容文字進行置頂處理的,所以,如果我們不對Label加以額外的設置,就會出現如下情況:

         

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