iOS第三方（显示视图的宽度高度）－ MMPlaceHolder

github:https://github.com/adad184/MMPlaceHolder#readme

 appDelegate添加，影响全局

[MMPlaceHolderConfig defaultConfig].lineColor = [UIColor redColor];
    [MMPlaceHolderConfig defaultConfig].lineWidth = 1;
    [MMPlaceHolderConfig defaultConfig].arrowSize = 5;
    [MMPlaceHolderConfig defaultConfig].backColor = [UIColor clearColor];
    [MMPlaceHolderConfig defaultConfig].frameWidth = 0;
    [MMPlaceHolderConfig defaultConfig].visibleKindOfClasses = @[UIImageView.class];
    
    //using it for frame debug    [MMPlaceHolderConfig defaultConfig].autoDisplay = YES;
    [MMPlaceHolderConfig defaultConfig].autoDisplaySystemView = YES;
    [MMPlaceHolderConfig defaultConfig].showArrow = YES;
    [MMPlaceHolderConfig defaultConfig].showText = YES;
    
    //using it to control global visible    [MMPlaceHolderConfig defaultConfig].visible = YES;

 使用的时候添加，影响单个

[iv2 showPlaceHolder];
    [iv3 showPlaceHolderWithLineColor:[UIColor greenColor]];
    [iv4 showPlaceHolderWithLineColor:[UIColor yellowColor] backColor:[UIColor colorWithRed:0.1 green:0.1 blue:0.1 alpha:0.5]];
    [iv5 showPlaceHolderWithLineColor:[UIColor whiteColor] backColor:[UIColor colorWithRed:1.0 green:0.5 blue:0 alpha:0.8] arrowSize:12];
    [iv6 showPlaceHolderWithLineColor:[UIColor whiteColor] backColor:[UIColor blackColor] arrowSize:25 lineWidth:3]

 效果图：