UILabel的文字默認是垂直居中顯示的，而且UILabel并沒有為我們提供設置垂直對齊方式的選項，所以要自己想辦法了。

我的辦法是給UILabel添加一個Category，來修改UILabel的繪制。話不多說上代碼：

// UILabel+VerticalAlignment.h

#import

@interface UILabel (VerticalAlignment)

// 文字頂部對齊

- (void)textAlignmentTop;

// 文字底部對齊

- (void)textAlignmentBottom;

@end

// UILabel+VerticalAlignment.m

#import "UILabel+VerticalAlignment.h"

@implementation UILabel (VerticalAlignment)

- (void)textAlignmentTop {

self.numberOfLines = 0;

CGSize fontSize = [self.text sizeWithAttributes:@{NSFontAttributeName:self.font}];

double finalWidth = self.frame.size.width;

CGSize maximumSize = CGSizeMake(finalWidth, CGFLOAT_MAX);

CGRect stringSize = [self.text boundingRectWithSize:maximumSize options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:self.font} context:nil];

int lines = (self.frame.size.height - stringSize.size.height) / fontSize.height;

for (int i = 0; i < lines; i++) {

self.text = [self.text stringByAppendingString:@"\n"];

}

}

- (void)textAlignmentBottom {

self.numberOfLines = 0;

CGSize fontSize = [self.text sizeWithAttributes:@{NSFontAttributeName:self.font}];

double finalWidth = self.frame.size.width;

CGSize maximumSize = CGSizeMake(finalWidth, CGFLOAT_MAX);

CGRect stringSize = [self.text boundingRectWithSize:maximumSize options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:self.font} context:nil];

int lines = (self.frame.size.height - stringSize.size.height) / fontSize.height;

for (int i = 0; i < lines; i++) {

self.text = [NSString stringWithFormat:@" \n%@",self.text];

}

}

@end

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