NSStringDrawingOptions
文本绘制选项。
enum {
NSStringDrawingTruncatesLastVisibleLine= 1 << 5,
NSStringDrawingUsesLineFragmentOrigin= 1 << 0,
NSStringDrawingUsesFontLeading= 1 << 1,
NSStringDrawingUsesDeviceMetrics= 1 << 3,
};
typedef NSInteger NSStringDrawingOptions;
常量
NSStringDrawingTruncatesLastVisibleLine
如果文本内容超出指定的矩形限制,文本将被截去并在最后一个字符后加上省略号。如果指定了NSStringDrawingUsesLineFragmentOrigin选项,则该选项被忽略。
NSStringDrawingUsesLineFragmentOrigin
绘制文本时使用 line fragement origin 而不是 baseline origin。
Theorigin specified when drawing the string is the line fragment origin and notthe baseline origin.
NSStringDrawingUsesFontLeading
计算行高时使用行间距。(译者注:字体大小+行间距=行高)
NSStringDrawingUsesDeviceMetrics
计算布局时使用图元字形(而不是印刷字体)。
Usethe image glyph bounds (instead of the typographic bounds) when computinglayout.
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// 获取字符串的大小 ios7
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- (CGSize)getStringRect:(NSString*)aString
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{
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CGSize size;
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NSAttributedString* atrString = [[NSAttributedStringalloc] initWithString:aString];
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NSRange range = NSMakeRange(0, atrString.length);
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NSDictionary* dic = [atrString attributesAtIndex:0 effectiveRange:&range];
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size = [aString boundingRectWithSize:CGSizeMake(237, 200) options:NSStringDrawingUsesLineFragmentOriginattributes:diccontext:nil].size;
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return size;
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}
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// 获取字符串的大小 ios6
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- (CGSize)getStringRect_:(NSString*)aString
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{
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CGSize size;
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UIFont *nameFont=[UIFont fontWithName:@"Helvetica" size:13];
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size=[aString sizeWithFont:nameFont constrainedToSize:CGSizeMake(237, 200) lineBreakMode:NSLineBreakByCharWrapping];
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return size;
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}
分类的方式
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#import "UILabel+StringFrame.h"
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@implementation UILabel (StringFrame)
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- (CGSize)boundingRectWithSize:(CGSize)size
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{
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NSDictionary *attribute = @{NSFontAttributeName: self.font};
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CGSize retSize = [self.text boundingRectWithSize:size
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options:\
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NSStringDrawingTruncatesLastVisibleLine |
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NSStringDrawingUsesLineFragmentOrigin |
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NSStringDrawingUsesFontLeading
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attributes:attribute
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context:nil].size;
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return retSize;
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}
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@end
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// 字符串
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NSString *str = @"日落时分,沏上一杯山茶,听一曲意境空远的《禅》,心神随此天籁,沉溺于玄妙的幻境里。仿佛我就是那穿梭于葳蕤山林中的一只飞鸟,时而盘旋穿梭,时而引吭高歌;仿佛我就是那潺潺流泻于山涧的一汪清泉,涟漪轻盈,浩淼长流;仿佛我就是那竦峙在天地间的一座山峦,伟岸高耸,从容绵延。我不相信佛,只是喜欢玄冥空灵的梵音经贝,与慈悲淡然的佛境禅心,在清欢中,从容幽静,自在安然。一直向往走进青的山,碧的水,体悟山水的绚丽多姿,领略草木的兴衰荣枯,倾听黄天厚土之声,探寻宇宙自然的妙趣。走进了山水,也就走出了喧嚣,给身心以清凉,给精神以沉淀,给灵魂以升华。";
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// 初始化label
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UILabel *label = [UILabel new];
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label.backgroundColor = [UIColor whiteColor];
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[self.view addSubview:label];
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// label获取字符串
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label.text = str;
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// label获取字体
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label.font = [UIFont fontWithName:nil size:18];
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// 根据获取到的字符串以及字体计算label需要的size
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CGSize size = [label boundingRectWithSize:CGSizeMake(320, 0)];
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// 设置无限换行
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label.numberOfLines = 0;
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// 设置label的frame
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label.frame = CGRectMake(0.0f, 50.0f, size.width, size.height)
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