ios-drawInRect:withAttributes

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http://stackoverflow.com/questions/19274408/drawinrectwithattributes-vs-drawinrectwithfontlinebreakmodealignment
- (void)drawRect:(CGRect)frame
{
NSMutableParagraphStyle *textStyle = [[NSMutableParagraphStyle defaultParagraphStyle] mutableCopy];
textStyle.lineBreakMode = NSLineBreakByWordWrapping;
textStyle.alignment = NSTextAlignmentCenter;
UIFont *textFont = [UIFont systemFontOfSize:16];

NSString *text = @"Lorem ipsum";

// iOS 7 way
[text drawInRect:frame withAttributes:@{NSFontAttributeName:textFont, NSParagraphStyleAttributeName:textStyle}];

// pre iOS 7 way
CGFloat margin = 16;
CGRect bottomFrame = CGRectMake(0, margin, frame.size.width, frame.size.height - margin);
[text drawInRect:bottomFrame withFont:textFont lineBreakMode:NSLineBreakByWordWrapping alignment:NSTextAlignmentCenter];
}

ios-drawInRect:withAttributes

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原文地址：http://www.cnblogs.com/qike/p/5404944.html