带填充间距的 UILabel 在项目中的使用

效果

实现方式：

1、自定义上文中的  SOInsetsLabel

2、在自定义 View 中初始化 label

//
//  PTDiscoverDetailHeader.m
//  kidsPlay
//
//  Created by LiLiLiu on 15/9/13.
//  Copyright (c) 2015年 LiLiLiu. All rights reserved.
//

#import "PTDiscoverDetailHeader.h"
#import "PTOperateItem.h"
#import "SOInsetsLabel.h"
#import "Util.h"

#define HEADERVIEW_MARGIN    10

static CGFloat const lblIndent = 16.0f;

static UIEdgeInsets titleLblInsets = {.top = lblIndent, .left = lblIndent, .bottom = lblIndent, .right = lblIndent};
static UIEdgeInsets descLblInsets = {.top = 0, .left = lblIndent, .bottom = lblIndent, .right = lblIndent};

static CGFloat const PTDiscoverDetailHeaderImageHeight      = 235.0f;

#define TOPIC_TITLE_FONT  [UIFont fontWithName:TextName size:18]


@interface PTDiscoverDetailHeader ()
@property (strong, nonatomic) SOInsetsLabel *topicTitleLbl;
@end


@implementation PTDiscoverDetailHeader

- (void)dealloc {
    SORELEASE(_item);
    SOSUPERDEALLOC();
}

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if(self) {
        [self addSubview:self.topicTitleLbl];
    }
    return (self);
}



- (void)layoutSubviews {
    [super layoutSubviews];
    
    CGSize size = self.bounds.size;
        
        self.topicTitleLbl.text = self.item.title;
        self.topicDescLbl.text = self.item.note;
        
        //文字高度
        CGFloat  titleHeight = [Util lableWithTextStringHeight:self.item.title andTextFont:TOPIC_TITLE_FONT andLableWidth:size.width-lblIndent*2];
        //
//        CGSize titleSize = [self.item.title boundingRectWithSize:CGSizeMake(size.width-lblIndent*2, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:TOPIC_TITLE_FONT} context:nil].size;
        
        self.topicTitleLbl.frame = CGRectMake(0, 0, size.width, titleHeight);
        
    }else{
        self.topicTitleLbl.frame = CGRectMake(0, 0, size.width, 0);
    }
    
}

#pragma mark - getter
- (SOInsetsLabel *)topicTitleLbl{
    if (!_topicTitleLbl) {
        _topicTitleLbl = [[SOInsetsLabel alloc] initWithFrame:CGRectMake(0, 0, CGRectGetWidth(self.bounds), 20) andInsets:titleLblInsets];
        _topicTitleLbl.backgroundColor = [UIColor  whiteColor];
        _topicTitleLbl.numberOfLines = 0;     
        _topicTitleLbl.lineBreakMode = NSLineBreakByWordWrapping;
        _topicTitleLbl.font = TOPIC_TITLE_FONT;
        _topicTitleLbl.textColor = [UIColor blackColor];
        _topicTitleLbl.textAlignment = NSTextAlignmentLeft;
    }
    return _topicTitleLbl;
}

@end

3、Util 类中根据文字大小和宽度计算高度的类方法

//根据文字的大小和既定的宽度，来计算文字所占的高度
+(CGFloat) lableWithTextStringHeight:(NSString*)labelString andTextFont:(UIFont*)font  andLableWidth:(float)width
{
    if (labelString == nil) {
        return 0.0;
    }
    
    NSDictionary *dic = @{NSFontAttributeName: font};
    return   [labelString boundingRectWithSize:CGSizeMake(width, 100000)
                                       options:NSStringDrawingUsesLineFragmentOrigin
                                    attributes:dic        // 文字的属性
                                       context:nil].size.height;
}