AutoLayout1、UILabel的高度自適應

//ZSYPopAdertiseView.m

- initWithTitleImage:(NSString *)titleImage
          TitleValue:(NSString *)titleValue
         ActionImage:(NSString *)actionImage
{
    self = [super init];
    if (self) {
        self.backgroundColor = [[UIColor lightGrayColor] colorWithAlphaComponent:defaultAlpha];
        self.userInteractionEnabled = YES;
        _leftImageView = [[UIImageView alloc] init];
        _leftImageView.image = [UIImage imageNamed:titleImage];
        _contentLabel = [[UILabel alloc] init];
        _contentLabel.numberOfLines = 0;
        _contentLabel.text = titleValue;
        _contentLabel.font = [UIFont systemFontOfSize:defaultFontSize];
        _contentLabel.textColor = [UIColor whiteColor];
        _actionButton = [UIButton buttonWithType:UIButtonTypeCustom];
        [_actionButton setImage:[UIImage imageNamed:actionImage] forState:UIControlStateNormal];
        [self addSubview:_leftImageView];
        [self addSubview:_contentLabel];
        [self addSubview:_actionButton];
        
        //對全部subviews設置約束
        [self initSubviews];
    }
    return self;
}

 

//設置subviews的約束

- (void)initSubviews {
    @weakify(self);
    
    //左側圖標
    [_leftImageView mas_makeConstraints:^(MASConstraintMaker *make) {
        @strongify(self);
        make.centerY.mas_equalTo(self.mas_centerY);
        make.height.mas_equalTo(self.leftImageView.image.size.height);
        make.left.mas_equalTo(self.mas_left).offset(defaultLeftPadding);
        make.width.mas_equalTo(self.leftImageView.image.size.width);
    }];
    
    //中間UILabel
    [_contentLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        @strongify(self);
        make.centerY.mas_equalTo(self.mas_centerY);
        make.left.mas_equalTo(self.leftImageView.mas_right).offset(defaultPerPadding);
        make.right.mas_equalTo(self.actionButton.mas_left).offset(-defaultPerPadding);
    }];
    
    //右側圖標
    [_actionButton mas_makeConstraints:^(MASConstraintMaker *make) {
        @strongify(self);
        make.centerY.mas_equalTo(self.mas_centerY);
        make.right.mas_equalTo(self.mas_right).offset(-defaultPerPadding);
        make.width.mas_equalTo(self.actionButton.imageView.image.size.width);
        make.height.mas_equalTo(self.actionButton.imageView.image.size.height);
    }];
    
    //注意：根據UILabel.text，再更新中間UILabel的高度
    [self mas_makeConstraints:^(MASConstraintMaker *make) {
        make.bottom.mas_equalTo(self.contentLabel.mas_bottom);
    }];
    
    [_actionButton addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
}

 

注意：

　　UILabel若是須要高度動態改變 ，設置約束時就不要設置 height約束