iOS小技巧20-iOS UILabel 文字设置垂直居中、垂直靠上、垂直靠下，设置edgeInsets

iOS小技巧20-iOS UILabel 文字设置垂直居中、垂直靠上、垂直靠下，设置edgeInsets

VerticalCenterTextLabel.h

#import 
typedef enum : NSUInteger {
    myVerticalAlignmentNone = 0,
    myVerticalAlignmentCenter,
    myVerticalAlignmentTop,
    myVerticalAlignmentBottom
} myVerticalAlignment;

@interface VerticalCenterTextLabel : UILabel
@property (nonatomic) UIEdgeInsets edgeInsets;

/**
 *  对齐方式
 */
@property (nonatomic) myVerticalAlignment verticalAlignment;

@end

VerticalCenterTextLabel.m

#import "VerticalCenterTextLabel.h"

@implementation VerticalCenterTextLabel

- (void)setVerticalAlignment:(myVerticalAlignment)verticalAlignment
{
    _verticalAlignment= verticalAlignment;
    [self setNeedsDisplay];
}

- (void)drawTextInRect:(CGRect)rect
{
    if (_verticalAlignment == myVerticalAlignmentNone)
    {
        [super drawTextInRect:UIEdgeInsetsInsetRect(self.bounds, self.edgeInsets)];
    }
    else
    {
        CGRect textRect = [self textRectForBounds:UIEdgeInsetsInsetRect(rect, self.edgeInsets) limitedToNumberOfLines:self.numberOfLines];
        [super drawTextInRect:textRect];
    }
}

- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines
{
    CGRect textRect = [super textRectForBounds:bounds limitedToNumberOfLines:numberOfLines];
    switch (_verticalAlignment) {
        case myVerticalAlignmentTop:
            textRect.origin.y = bounds.origin.y;
            break;
            
        case myVerticalAlignmentBottom:
            textRect.origin.y = bounds.origin.y + bounds.size.height - textRect.size.height;
            break;
            
        case myVerticalAlignmentCenter:
            textRect.origin.y = bounds.origin.y + (bounds.size.height - textRect.size.height) / 2.0;
            break;
            
        default:
            break;
    }
    return textRect;
}
@end

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