UILabel TextAlignement垂直顶部

Question

我有一个很大的问题,我有一个以UILabel编程方式创建,然后通过界面生成器连接,我已经定位在我需要的地方,但我看到我设置的文本它打印在中心UILabelBox,我发现了很多问题,但我不知道我可以使用它,我发现了这个:

//
//  VerticallyAlignedLabel.h
//

#import <Foundation/Foundation.h>

typedef enum VerticalAlignment {
    VerticalAlignmentTop,
    VerticalAlignmentMiddle,
    VerticalAlignmentBottom,
} VerticalAlignment;

@interface VerticallyAlignedLabel : UILabel {
@private
    VerticalAlignment verticalAlignment_;
}

@property (nonatomic, assign) VerticalAlignment verticalAlignment;

@end

//
//  VerticallyAlignedLabel.m
//

#import "VerticallyAlignedLabel.h"


@implementation VerticallyAlignedLabel

@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

任何人都可以帮我,我可以使用它吗？

Answer 1

我知道回答可能会迟到,但我是这样做的:
我为UILabel制作了一个分类,并-setVerticalAlignmentTop在需要时调用.

// UILabel(VAlign).h
#import <Foundation/Foundation.h>
@interface UILabel (VAlign)
- (void) setVerticalAlignmentTop;
@end

// UILabel(VAlign).m
#import "UILabel(VAlign).h"
@implementation UILabel (VAlign)
- (void) setVerticalAlignmentTop
{
    CGSize textSize = [self.text sizeWithFont:self.font
                            constrainedToSize:self.frame.size
                                lineBreakMode:self.lineBreakMode];

    CGRect textRect = CGRectMake(self.frame.origin.x,
                                 self.frame.origin.y,
                                 self.frame.size.width,
                                 textSize.height);
    [self setFrame:textRect];
    [self setNeedsDisplay];
}

@end

Answer 2

你可以这样做.......

1. numberOfLines从IB 设置标签的属性0

2. 将您的标签设置lineBreakMode为UILineBreakModeWordWrap(非常非常重要)

现在,无论你在标签上设置什么,只需在它上面添加几个@"\n"..... ex.-

[yourTextLabel setText:@"myLabel\n\n\n\n\n"];