1:兼容字体大小6plue跟它以下的区别
#define FONT_COMPATIBLE_SCREEN_OFFSET(_fontSize_) [UIFont systemFontOfSize:(_fontSize_ *([UIScreen mainScreen].scale) / 2)]
在iPhone4~6中,缩放因子scale=2;在iPhone6+中,缩放因子scale=3
运用时:
myLabel.font=FONT_COMPATIBLE_SCREEN_OFFSET(15);
扩展:画一像素的宏
#define SINGLE_LINE_WIDTH (1 / [UIScreen mainScreen].scale) #define SINGLE_LINE_ADJUST_OFFSET ((1 / [UIScreen mainScreen].scale) / 2)
运用时:
CGFloat xPos = 5; UIView *view = [[UIView alloc] initWithFrame:CGrect(x - SINGLE_LINE_ADJUST_OFFSET, 0, SINGLE_LINE_WIDTH, 100)];
2:APP虚拟器可以运行,在真机调试时报这个问题,因为把产品名称设成中文导致
App installation failed There was an internal API error. Build Settings中的Packaging的Product Name设置成中文
3:Xcode证书存放路径
资源库/MobileDevice/Provisioning Profiles
4:使用第三方RDVTabBarController底部Tab时
若要隐藏时把动画关掉,就不会出现一闪的情况
//隐藏底部菜单 - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; [[self rdv_tabBarController] setTabBarHidden:YES animated:NO]; } - (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; [[self rdv_tabBarController] setTabBarHidden:NO animated:NO]; }
5:Masonry一些其它内容
a:make.equalTo 或 make.greaterThanOrEqualTo (至多) 或 make.lessThanOrEqualTo(至少)
make.left.greaterThanOrEqualTo(label); make.left.greaterThanOrEqualTo(label.mas_left); //width >= 200 && width <= 400 make.width.greaterThanOrEqualTo(@200); make.width.lessThanOrEqualTo(@400)
b:masequalTo 和 equalTo 区别:masequalTo 比equalTo多了类型转换操作,一般来说,大多数时候两个方法都是 通用的,但是对于数值元素使用mas_equalTo。对于对象或是多个属性的处理,使用equalTo。特别是多个属性时,必须使用equalTo
c:一些简便赋值
// make top = superview.top + 5, left = superview.left + 10, // bottom = superview.bottom - 15, right = superview.right - 20 make.edges.equalTo(superview).insets(UIEdgeInsetsMake(5, 10, 15, 20)) // make width and height greater than or equal to titleLabel make.size.greaterThanOrEqualTo(titleLabel) // make width = superview.width + 100, height = superview.height - 50 make.size.equalTo(superview).sizeOffset(CGSizeMake(100, -50)) // make centerX = superview.centerX - 5, centerY = superview.centerY + 10 make.center.equalTo(superview).centerOffset(CGPointMake(-5, 10))
d:and关键字运用
make.left.right.and.bottom.equalTo(superview); make.top.equalTo(otherView);
e:优先;优先权(.priority,.priorityHigh,.priorityMedium,.priorityLow)
`.priority`允许您指定一个确切的优先级 `.priorityHigh`等价于UILayoutPriorityDefaultHigh `.priorityMedium`介于高跟低之间 `.priorityLow` 等价于UILayoutPriorityDefaultLow 实例: make.left.greaterThanOrEqualTo(label.mas_left).with.priorityLow(); make.top.equalTo(label.mas_top).with.priority(600);
g:使用mas_makeConstraints创建constraint后,你可以使用局部变量或属性来保存以便下次引用它;如果创建多个constraints,你可以采用数组来保存它们
// 局部或者全局 @property (nonatomic, strong) MASConstraint *topConstraint; // 创建约束并赋值 [view1 mas_makeConstraints:^(MASConstraintMaker *make) { self.topConstraint = make.top.equalTo(superview.mas_top).with.offset(padding.top); make.left.equalTo(superview.mas_left).with.offset(padding.left); }]; // 过后可以直接访问self.topConstraint [self.topConstraint uninstall];
h:mas_updateConstraints更新约束,有时你需要更新constraint(例如,动画和调试)而不是创建固定constraint,可以使用mas_updateConstraints方法
- (void)updateConstraints { [self.growingButton mas_updateConstraints:^(MASConstraintMaker *make) { make.center.equalTo(self); make.width.equalTo(@(self.buttonSize.width)).priorityLow(); make.height.equalTo(@(self.buttonSize.height)).priorityLow(); make.width.lessThanOrEqualTo(self); make.height.lessThanOrEqualTo(self); }]; //调用父updateConstraints [super updateConstraints]; }
i:mas_remakeConstraints更新约束,mas_remakeConstraints与mas_updateConstraints比较相似,都是更新constraint。不过,mas_remakeConstraints是删除之前constraint,然后再添加新的constraint(适用于移动动画);而mas_updateConstraints只是更新constraint的值。
- (void)changeButtonPosition { [self.button mas_remakeConstraints:^(MASConstraintMaker *make) { make.size.equalTo(self.buttonSize); if (topLeft) { make.top.and.left.offset(10); } else { make.bottom.and.right.offset(-10); } }]; }