设置lable内容不上下居中

转载自:http://dong-zsh.github.io/2015/10/14/%E8%AE%BE%E7%BD%AElable%E5%86%85%E5%AE%B9%E4%B8%8D%E4%B8%8A%E4%B8%8B%E5%B1%85%E4%B8%AD/

#import 
typedef enum
{
VerticalAlignmentTop = 0, // default文字居上
VerticalAlignmentMiddle,
VerticalAlignmentBottom,
} VerticalAlignment;

@interface mylable : UILabel

{
@private
VerticalAlignment _verticalAlignment;
}

@property (nonatomic) VerticalAlignment verticalAlignment;

@end
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#import "mylable.h"

@implementation mylable

@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];
}

###用法

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mylable *lable = [[mylable alloc] initWithFrame:CGRectMake(10, 400, 100, 200)];
lable.text = @"dajdiojajdajdjajdadakdajdiaodaiojdioajdioajidjaijdajdadadna";
lable.backgroundColor = [UIColor grayColor];
lable.numberOfLines = 0;
[lable setVerticalAlignment:VerticalAlignmentTop];
[self.view addSubview:lable];

转载于:https://www.cnblogs.com/CodingMann/p/5120296.html

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