tableView上面多出来20个像素，是因为自动布局的缘故，设置一下属性就可以解决问题
self.edgesForExtendedLayout = UIRectEdgeNone;
如果想数组进行倒序排列
NSMutableArray *array = [NSMutableArray arrayWithObjects:@“1”,@“2”,@“3”,nil];
NSArray *reversedArray = [[array reverseObjectEnumerator allObjects];
如果想scrollView不能上下滑动只能左右滑动下面设置可以实现
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
Float oldY = 0.0;
[scrollView setContentOffset:CGPointMake(scrollView.contentOffset.x,oldY)];
}
设置UILabel行间距和字间距
+(void)setLabelSpace:(UILabel*)label withValue:(NSString*)str withFont:(UIFont*)font{
NSMutableParagraphStyle*paraStyle = [[NSMutableParagraphStylealloc]init];
paraStyle.lineBreakMode=NSLineBreakByCharWrapping;
paraStyle.alignment=NSTextAlignmentLeft;
paraStyle.lineSpacing=UILABEL_LINE_SPACE;//设置行间距
paraStyle.hyphenationFactor=1.0;
paraStyle.firstLineHeadIndent=0.0;
paraStyle.paragraphSpacingBefore=0.0;
paraStyle.headIndent=0;
paraStyle.tailIndent=0;
//设置字间距NSKernAttributeName:@1.5f
NSDictionary*dic =@{NSFontAttributeName:font,NSParagraphStyleAttributeName:paraStyle,NSKernAttributeName:@0.0f};
NSAttributedString*attributeStr = [[NSAttributedStringalloc]initWithString:strattributes:dic];
label.attributedText= attributeStr;
}
5、计算UILabel的高度(带有行间距的情况)
+(CGFloat)getSpaceLabelHeight:(NSString*)str withFont:(UIFont*)font withWidth:(CGFloat)width {
NSMutableParagraphStyle*paraStyle = [[NSMutableParagraphStylealloc]init];
paraStyle.lineBreakMode=NSLineBreakByCharWrapping;
paraStyle.alignment=NSTextAlignmentLeft;
paraStyle.lineSpacing=UILABEL_LINE_SPACE;
paraStyle.hyphenationFactor=1.0;
paraStyle.firstLineHeadIndent=0.0;
paraStyle.paragraphSpacingBefore=0.0;
paraStyle.headIndent=0;
paraStyle.tailIndent=0;
NSDictionary*dic =@{NSFontAttributeName:font,NSParagraphStyleAttributeName:paraStyle,NSKernAttributeName:@0.0f};
CGSizesize = [strboundingRectWithSize:CGSizeMake(width,KHeight)options:NSStringDrawingUsesLineFragmentOriginattributes:diccontext:nil].size;
returnsize.height;
}
