UILabel TextAlignement垂直頂部

Question

我有一個很大的問題，我有一個UILabel編程創建，然後通過接口生成器連接，在那裏我已定位在我需要的位置，但我看到我設置它的文本它打印在中心在UILabelBox，我發現了很多問題，但我已經不知道我可以使用它，我發現這一點：

// 
// 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 

任何人都可以幫助我，我如何使用它嗎？

Answer 1

我知道這可能會遲到回答，但我沒有這樣說：
我做了一個類別的UILabel和呼叫-setVerticalAlignmentTop在需要的時候。

// 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這一點.......

1. 設置標籤的numberOfLines財產0從IB

2. 設置標籤的lineBreakMode爲UILineBreakModeWordWrap（非常非常重要）

現在無論你在標籤上設置什麼，只需在其上附加幾個@「\ n」..... ex.-

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