Created
June 22, 2014 03:44
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brucepdx 垂直式對齊 UILabel(https://discussions.apple.com/thread/1759957?tstart=0)
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// | |
// 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 |
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