UILabel TextAlignement 垂直顶部

Question

我有一个很大的问题，我有一个以编程方式创建的UILabel，然后通过接口生成器连接，我已经定位到我需要的位置，但我看到我在其中设置的文本打印在@的中心987654322@，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

谁能帮助我如何使用它？

Answer 1

我知道现在回答可能会晚，但我是这样做的：
我为 UILabel 创建了一个类别，并在需要时致电 -setVerticalAlignmentTop。

// 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. 从 IB 设置标签的 numberOfLines 属性 0

2. 将标签的lineBreakMode 设置为UILineBreakModeWordWrap（非常非常重要）

现在无论您在标签上设置什么，只需在其上附加几个 @"\n" ..... 例如-

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