カテゴリを実装することで、あなたが望むことをしました:
.h
@interface UILabel (VerticalAlign)
- (void)alignTop;
- (void)alignBottom;
@end
.m
@implementation UILabel (VerticalAlign)
#pragma mark
#pragma mark - Align Methods
- (void)alignTop
{
[self setFrame:[self newLabelFrame:UIControlContentVerticalAlignmentTop]];
}
- (void)alignBottom
{
[self setFrame:[self newLabelFrame:UIControlContentVerticalAlignmentBottom]];
}
#pragma mark
#pragma mark - Helper Methods
- (CGRect)newLabelFrame:(UIControlContentVerticalAlignment)alignment
{
CGRect labelRect = self.frame;
NSStringDrawingOptions options = NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesFontLeading;
CGRect textRect = [self.text boundingRectWithSize:CGSizeMake(227.f, CGFLOAT_MAX)
options:options
attributes:@{NSFontAttributeName:self.font}
context:nil];
CGFloat textOffset = labelRect.size.height - textRect.size.height;
UIEdgeInsets contentInsets;
if (alignment == UIControlContentVerticalAlignmentTop)
{
if (textOffset < (labelRect.size.height/2.f))
{
contentInsets = UIEdgeInsetsMake(-textOffset, 0.f, 0.f, 0.f);
}
else
{
contentInsets = UIEdgeInsetsMake(0.f, 0.f, textOffset, 0.f);
}
}
else
{
if (textOffset < (labelRect.size.height/2.f))
{
contentInsets = UIEdgeInsetsMake(0.f, 0.f, -textOffset, 0.f);
}
else
{
contentInsets = UIEdgeInsetsMake(textOffset, 0.f, 0.f, 0.f);
}
}
return UIEdgeInsetsInsetRect(labelRect, contentInsets);
}
@end
「NumberOfLines」を0に設定する必要があることに注意してください。この例は、複数行オプションで機能します。
上記のカテゴリを実装した後、次の操作を実行できます。
[myLabel setText:finalRecipe];
[myLabel alignTop];
乾杯!