UILabel TextAlignement垂直顶部

Question

我有一个很大的问题，我有一个UILabel编程创建，然后通过接口生成器连接，在那里我已定位在我需要的位置，但我看到我设置它的文本它打印在中心在UILabelBox，我发现了很多问题，但我已经不知道我可以使用它，我发现这一点：

// 
// 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 

任何人都可以帮助我，我如何使用它吗？

Answer 1

我知道这可能会迟到回答，但我没有这样说：
我做了一个类别的UILabel和呼叫-setVerticalAlignmentTop在需要的时候。

// 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

可以按如下方式做到这一点.......

1. 设置标签的numberOfLines财产0从IB

2. 设置标签的lineBreakMode为UILineBreakModeWordWrap（非常非常重要）

现在无论你在标签上设置什么，只需在其上附加几个@“\ n”..... ex.-

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